This may not be popular.
True relationship is between one person and everyone, simultaneously. The human body was constructed in order to disrupt this relationship, and to focus on isolation, so that rather than being in relationship with everyone, you are in relationship with typically only one other person.
By becoming closer to their body, and attempting to unite with the body, there is actually an attempt to move AWAY from everyone else. Far more is excluded than included. By attempting to join with "only one", 99.99% of the rest of existence is left out. One winner and billions of losers, as is always the result of competition. And so the sex act is a total opposite of true joining.
Bodies cannot join, they cannot even share the same space. One part protrudes, another caves in, there seems to be a surface friction but there is never a true merging. The ritual of the sexual act is really a ritual to death and sin, whereby the body is emphasized over spirit in order to move towards the body, towards sin, towards hell, and towards death.
Intercourse is movement towards death because it emphasizes that the body is real, it highlights sensations over knowledge, it shuts spirit out of awareness, focuses on the body's sensors, eyes, touch and so on, and makes you "lose your mind." It produces and increases body identification, believing you are the body and that you are interacting with a person who is a body. This closes the spiritual eye, shuts out life, and proceeds towards death.
You could say that by a man and woman copulating, they are performing a death ritual, in which they are attempting to manufacture a separate self, born from death, born in pain, and produced as a result of an illusion of joining made to actually prevent joining. The separation then increases, there is a fragmentation, and another "entity" shows up as the result.
This is very much no different to the illusion of cell division, in which separation is used to split cells in order to multiply them. This is called reproduction, but it is the opposite of creation of life. Bodies come together and do not join and some matter is transferred and some illusory biological processes occur and another body appears, increasing bodies. But what has actually occurred is separation has been used to testify to the end of God and a symbol of the separation has emerged. It's called birth, but it's an eruption of death.
All sexual acts involving a person attempt to utilize the person's body to get something, to meet a perceived need, or to mutually take from each other. Since the body is a picture of selfishness, resulting from specialness, sin and isolation, both body identified persons see themselves as lacking and limited, and want to fulfill themselves by getting something out of the activity. Of course, we then imagine that if we "only give and don't receive" this is somehow more loving, but giving without receiving is sacrifice, and you can be sure the ego is right there to emphasize it.
More or less, everyone with a body is interested in self gratification, a kind of masturbation, in which ultimately they seek through the body to experience something external, to sense something, to have something happen to them which they find to be preferable. For some the "happens to me" might be painful, sadistic and twisted, while for others they might seek what appears to be an illusion of "love making". But rest assured, sex is murderous and cannot in any way create love.
"What is not love is murder" is based on the Golden Rule, that what applies to one applies to another equally. When this law is broken by our egos, we move into a state of imbalance where something is more for one and less for another, there is finite limitation, there is "give and take", and attempts to believe something is true of one person not the other. "It's my turn" is selfish. Two people copulating is an attempt on both parts, typically, to gain something which the other is perceived to give them, both taking from each other, usually under the guise of giving.
Bodies cannot create. They do not create life. Life forms are not alive, they are death forms. Illusions of life. Babies bodies are just as much illusory as adult bodies. Bodies reproducing is a testament to the ego's attempt to produce alternative, different, unique, separated off identities. Little walking prison cells for the mind to inhabit. There is no particular glory in the production of an allegedly "god given" (ego given) baby any more than there is glory in those children becoming adults and trying to merge back together. You'd think it should be obvious that the bodies should not have been produced through separation in the first place if later a "re-joining" is the supposed goal.
Bodies cannot join. Just so you know, no two atoms of matter can ever touch each other. They are repelled by nuclear forces. The sensation of someone touching you is not really them touching you, it's the force fields repelling your force fields and causing there to seem to be a sensation of collision. No two bodies have ever touched and lived to talk about it, because this would result in a nuclear explosion. And the earth does not "move" this way.
For the most part, most of us body identified people are rather self absorbed with our bodies. Men and women alike preen and prune as if attempting to allegedly attract a mate, but quite honestly, almost all of it is self adoration. Because it is the body that we are in love with, not people. Bodies are idols to worship and we worship no bodies more than our own.
Most of what we allegedly do to prepare ourselves for a partner (an excluder) is of no interest to them and they probably can't relate to it. We bolster ourselves up in our vanity and egotism so that if we approve of our own condition, we're satisfied. We're all a bunch of egomaniac vain self-obsessed fools, falling over ourselves to manipulate someone into doing something to us that we prefer so that we can get our own rocks off - a form of positive victimhood.
Having become body identified, we have identified with being separate. The bodies are literally separate. There is space between them and the bodies will never touch. There is even a line in the course that says God is the only one who has ever touched his creations. Going into body mode, we then go through this process of trying to hump the brains out of all the other body identified people, in an attempt to overcome the very separation that we bought into in the first place, without doing so.
And there really is no real attempt TO do so, the whole purpose of it is to STAY SEPARATE. The whole dynamic of bodies joining is an attempt to KEEP the separation going, to reproduce the separation, and to produce more separate things. "Babies" come from this, as an increase in the population of ego flesh suits, ready for the next mind to be trapped in a brain and ready to suffer.
You could say, that the more an intimate couple focuses on the body, the less connected they are. The more they focus attention on sex, the more love is shut out. The more they make the body real, the more disconneced they become and have no real relationship. Then it becomes just about the physical sex, which is not love. They come together, almost literally, to separate from each other. Only love joins people together, not the body. And by starting out by going into body identification, they have already moved away from love, away from relationship and away from true joining. You could even say that this is a form of sickness.
In holy relationship there is no interest in the body for its own merits or purposes. It is recognized that the body is not inherently pleasurable, and anything related to it is not the cause of joy. In fact, the body would diminish true pleasure (which comes from doing God's will), by shutting God out of the equation in order to "sin together." Is it any wonder that a vast majority of sexual practice occurs in the dark, under the sheets, behind closed doors, in guilt and shame and fear, perhaps even with eyes closed? What is there to hide? Or rather, what are we hiding from? God?
The sins of the flesh, so to speak, include temptation. The temptation to believe that a son of God is a body. To then relate to their body as if it is the person, which is really an attack on the person and an attempt to imprison them. And to even ignore their body and focus on your own, for what it is getting from them. What you think you're getting from them is the rest of your self, which they stole, and housed in their body, which you hate them for and want to destroy them for, and you plug yourself into them in an attempt to regain what you think you do not have.
Being tempted by physical form is also another example of the rejection of Christ Vision and a willingness to be blinded by perception of form. As we oogle the nude pictures or watch the naughty porn movies or get all excited upon seeing a physical specimen we like, we are quite strongly falling for illusions, entering into body vision, losing sight of the truth, losing our minds, losing sanity, losing sight of the light beyond the body, and preferring bodies to God.
Of course, all of this is enough to induce guilt and make everyone feel like dirty little sinners. Which the ego is perfectly happy to label you with. Let's say that there is nothing at all wrong or sinful about any such activities because they are not real. And you can bet that millions of people are still "doing it" right now and will continue to do so for a long time to come. Course students included. But it is what it is.
Sex is something we invented, for a purpose. The only HOLY use of the body is for extending love and perhaps, if conception happens in such a way as that the persons are in christ vision and barely even noticing the body at all, you could call this the ultimate use of the body for procreational purposes only. But we have to also realize that the entire functional mechanism of what causes a man to inseminate a woman for example, is entirely based on sensations, body senses, chemistry, physical interaction, and usually hormonally driven, testosterone powered desire. And that's all at the level of ego body stuff. And it's selfish.
In essence, in truth, there were never supposed to be bodies in the first place. Yet alone to use them for separation, to make bodies real, to mistake subtle pain for pleasure, or to mistake copulation for love. There isn't anything love related about a sexual act. Unconditional love has nothing to do with it. It's purely a physical, biological, sensory process. Producing feedback, perceptions and justifying certain behaviors. You can do the same exact procedures with or without love being present.
Of course, someone who is loving, truly, unconditionally, may well enjoy the sexual performance with less guilt, more joy, greater fearlessness and confidence, but the point will come eventaully where what the body "offers" is so pale in comparison to what the spirit offers, that all desire for intercourse will end. Spiritual marriage, mind-to-mind joining, oneness with God, are orders of magnitude more meaningful and enjoyable than anything the body has to offer with its parody of love. "A teacher of God is willing to give up all the pleasures of the world." Knowing that you are gaining far more than you are giving up.
This is not to say, you have to give up sex right now. I'm not going to and nor is most of the planet. But we ARE in a process of learning what it really IS, and what it is not, as part of our journey home towards true union with God. And we can use this information to help move our special, sexual relationships, with others or self, towards a more innocent, holy experience, as we transition onwards its eventual total relinquishment.
At some point we will come to recognize it is not possible to do ANYTHING REAL with the body, and so will stop using the body entirely. Until then, boink your brains out if you so choose, or not. It's up to you - free will. But keep in mind, your MIND is more important than your body, and if body identification is increasing as a result of how you look at what you're doing, you're heading in the wrong direction.
In heaven there is no sex. In heaven, there is the constant bliss of needing nothing and being permanently fulfilled. Surely this is better than an occasional splurt at the end of a long road of effort. And certainly better than the frustrations and failures of sexual attempts to separate from God.