What sex position the best to perform, can full satisfy the girls?

almost anything from the back penetrates at a good angle plus you can use your hands for clitoral stimulation

depends on the girl.
I love Doggy and revers cowboy.

I like them all :)

Doogy style is my favorite thou. Some girls don't like it, but I do. The penetration is awesome in that position and it drives my guy crazy

69 has to be the best, because you have eye contact and I think its more comfortable. doggy style isn't as fun.

I think it's dependent on your length and how sensitive the girl in question is. Most women find it easier to orgasm during penetration if she is on top or from behind as it's easier for her to control the depth.

All positions are great though even if they don't bring you to climax. The best bet is to just try out every position you can both think of - when she finds one she likes she'll probably want you to stick to that for a while.

grace86 is right that it varies from person to person. One standard suggestion is that the girl put a big pillow under her butt/lower back while in missionary. This creates a different angle and provides more penetration and more likelihood of hitting the g-spot.