We did not join a religious cult. It did take us to spiritual vistas of sexual beauty and unity. In 1977 a long-time friend of mine told me he wanted to try it with me. Again, a spiritual experience was found to grow from this humblest of biological acts. That, i have come to believe, is part of our neurological hard-wiring.
Human beings seem to be naturally equipped to experience the metaphysical world.
Tantra provides both repetition and attentiveness. It is not the only way to achieve spiritual bliss, as its religious practitioners assert, but it is one way, and that is good enough for me. Especially, notice that there is a brief moment at the onset of orgasm when you are consciously aware that it is about to occur but it has not yet become inevitable. That's where you will later spend your time. Get to know how many contractions you experience.