The man-on-top missionary sex position is the most commonly used position for most heterosexual couples.
In this sexual position, a woman lies on her back and is penetrated by a man lying on top of her. This face-to-face position which allows you to look into each other's eyes. It also allows the partners to stimulate the breasts and makes for great kissing.

The main disadvantage of this sex position is that the clitoris is not stimulated much during intercourse. For variation of this golden-oldie, the woman can lock her legs around her partner's, as indicated. To increase stimulation, try the wrap-around missionary position.

Doggy
Reverse cowgirl variation
Side entry missionary
Split level
Woman on top