With guys I would say Cowgirl. Missionary would come second. Any way I can see his face when he cums.
I have tried to go from cover to cover with the Karma Sutra but many of them are beyond me. Its fun trying though.
My new story has been awarded the Recommended Read. If you adore a needy bottom and fancy a short, but very naughty read...
Some out of them are my super favorites.... I've found the graphics and small description here ;)
Ride 'Em Cowgirl
Have your partner lie on her back with a pillow under her hips. Then, facing her, straddle one of her legs and use yours to rub against her clitoris.
The Laconic Lounger
Have your partner lie on her back with two pillows under her upper back. Kneel between her legs and draw slow circles around her clitoris with one hand. Use your free hand to massage her breasts, or just have a hot makeout sesh.
The Rocket
You know the Beyoncé song that starts, "Let me sit this aaaaass on you"? That's what you're going for here. Kneel over her shoulders and let your butt brush against her nipples while she gets intimate with your clitoris.
Back That Ass Up
Have you partner get on all fours and kneel right behind her, grinding your hips against her butt. Reach around and finger her clitoris with one hand (the other is free to help out, engage in some nipple play, or tug on her ponytail).
The Classic Scissor
How to: Have your partner lie on her side and straddle one of her legs so your clits rub together. Grind on. It's a classic for a reason.
The Espresso
How to: This position is steamy and intense — maybe even too intense for some. Kneel facing each other with your knees intertwined and your bodies touching. Slowly grind against each other's thighs while you make out.
The Rockin' Rockette
How to: Get your legs in the air! Lie on your back and have your partner kneel behind you. From there she can kiss, lick, and suck on your clitoris while penetrating you with her free hand or a dildo.
Tantric Tête-à-Tête
Face each other, sitting, with your legs spread. Use a vibrator on her clitoris or just use your fingers. It's all about figuring out what really turns the other person on, so try everything, but if she starts making her O-face, don't stop.
The Bridge to Pleasuretown
How to: Have your partner lie on her back with two pillows under her hips. Kneel between her legs, drape her legs over your shoulders, and go to town.
"If, after hearing my songs, just one human being is inspired to say something nasty to a friend, or perhaps to strike a loved one, it will all have been worth the while." - Tom Lehrer
"There is no such thing as good luck or bad luck; only adequate or inadequate preparation for a statistical universe." - Robert Heinlein