How can anyone choose just one position? 
Okay Lurk, then name your favorites. 
I had a boyfriend that used to enjoy me putting my legs over the arms of a chair. I wasn't comfortable with it at first because of the view I was giving him, but this was the guy I dated that was older who enjoyed having me do things I wasn't comfortable with. But once we began having sex, with him knelt in front of me and my bottom to the edge of the cushion, I found it very much enjoyable.
I would also like to admit putting my friend in this same position a few weeks ago.
Well, in no particular order, and not as an exhaustive list:
- kneeling beside a woman on her back, receiving a blowjob and rubbing against her breasts and nipples, while using my free hand and/or a vibrating dildo on her. Possibly a finger in her rear as well.
- from behind, with her on her stomach, legs apart or together
- her on top, facing me
- spooning
- doggy style
- 69, or variants thereof
-missionary, with her legs up
...to name some.