My partner does and we laugh! Its usually because Ive been banging her from behind doggystyle. The physics of it are pretty easy to understand really.
I went through a phase of doing this quite a bit. I HATED it, it was embarrasing and a mood killer. Now I don't care when it happens. Strangely it very rarely happens to me anymore.
OMG. this is SOOOO embarassing for me. I laugh when it happens and so does my boyfriend. But OMG i hate them.. and i cant seem to stop them or feel them b4 they come out. Its just unstoppable. N when they happen he laughs.. BUt they only happen after doing it doggy style.. coz he pounds me. but like. omg no i dont like them. I dunno whether he does or not. :/
I don't get too embarrassed. It's just a fact of life, it happens, oh well. lol But I had no idea that you could make yourself do it! lol