I know this is ask the girls, but as a Guy. I love when your lady will sit on my face and grind away til her own orgasm is so intense that her legs tighten around my head.
Omggg yes. The only downfall (literally) is when my orgasm is so intense I can barely keep my legs up and collapse all over him. I love it so much but my boyfriend refuses to let me do it because he says I'll get addicted -.-
It's fun...especially for those who like to maintain control because it's easier to pace yourself. Unless of course your partner grabs you by the hips and slams you onto their face. But umm...yeah...I enjoy it. I do prefer to be on my back though. It's a lot more relaxed that way and you can lose control without worrying about tipping over.