I used to assume subtle body sex was something both people must be taoists for to take place.
I am sure that is one type of it, however, now I am hearing of people/perhaps experiencing such orgasms myself in social situations where the other people have no idea what is going on!

(Or do but do subconsciously on some level perhaps expressed in laughter?)
One of my girl friends who IS energy/chakra sensitive, and I, had some experiences with this subtle body sex, I beleive, although I could not realize that this was happening at the time as I am new to this concept. All we did was to put our hands on each other's belly's and breath! We played with pulsing the chi, too. It was really fun, feeling the energy from the hand go to expanding and contracting with someone's center of gravity--very energizing and relaxing, perhaps blissful!
I suppose it is just the yin yang flow in the "deep center." I used to think subtle body sex might include more gross orgasm with the bringing up of the jing chi, but now I see, perhaps, it is a lot more subtle than that?
Or not?