Let me try to articulate how I think about that.
It's just another means and description of the phenomenon known as awakening the Kundalini Chakra by way of meditation, tantric massage, or whatever.
What this does, if applied successfully, is elevating you to another level of existence, and giving you glimpses of even higer levels of existence, in similar gravity to what is often told here about various psychedelic drugs.
I think similar things could be said of that part of Satanism, if it wouldn't be abused to degrade and harm other people so much.
There are levels of orgasm/sexual energy/orgasmic potency/however you want to call this, which will meld your 'field/aura/spirit/mind' with your partner and vice versa, giving you the most intense intimacy imaginable.
Insert: While being melded together, what happens 'down there' as seen from above in some sort of out-of-body experience (Yes. I really mean that.) is almost unimportant, like some far echo from below. Happening automatically, maybe interupted by some synchronous 'Oh, that must have been good? Again!', giggling detached, and surfing the waves up there, whereever that is. /endinsert
But that is not all.
They can also give you slightly superhuman abilities regarding physical fitness.
For a time.
Then there are things which can only be called supernatural, like precognition for example. For other people there may be different supernatural phenomena.
I write this, because I experienced this only once in this full intensity in the summer of 1988, giving me insight to several overlapping timelines, and their probabilities, showing me events up to the summer of 2023.
And now I'm blind. S..T! Well, not really, there are more, but rather discrete, not continous and vague, clustered around somewhere 2045 to 2050, and personal, not telling much about world events, or science & technology. And they 'feel' censored, because everything is looking normal, but I can't get one look at the sky. Isn't that strange?
Anyways, too much personal stuff. What I want to say and repeat is that things can happen during sex between 'initiated/like-minded/loving/trusting' partners, which simply aren't possible with just sex, especially under the constraints of stress due to safer sex practices, hormonal imbalance, fear, physical unfitness, and the general pressure most people seem to feel.
It's really hard to describe, the same way psychonauts can't describe their rides on a heroes dose, or something. One can try, but it can only be a pale shadow of the real experience.
Edit: I realize that this could be interpreted as rambling "Good sex is good!", but that is not what I mean. It's just that there are different levels, and I'm thinking most of you haven't experienced them. So even if you are satisfied, you can't know what you have missed, so far.
Until...