As far as physical turn on's I like small waists, flat stomachs, of coarse it's important to have a cute face and nice hair is important to me too. I also prefer girls about 5'5" and shorter. I have been with the taller girls before and just didn't like it.
As far as sexual turn-ons, I just like a girl to be assertive as well as open minded at times. I like to be an adventurer so I like a girl that is willing to do the same.
If I could find a girl that met all those qualities, I would marry her on the spot. My current girlfriend meets all the physical standards, and I'm working with her on the sexual standards. I can get her to try other positions, etc. I just have a hard time getting her outside of the bedroom. I think that's how most girls are though.