### Comment:
Can you provide a list of common sex positions and their variations?

### REPLY:
There are various common sex positions and their variations that couples can explore. Some popular positions include missionary, doggy style, cowgirl, and reverse cowgirl. Missionary position involves the man lying on top of the woman, face-to-face. Doggy style involves the woman being on all fours, and the man penetrating from behind. Cowgirl involves the woman straddling the man and being in control of the rhythm. Reverse cowgirl is similar to cowgirl, but the woman faces away from the man. These positions can be modified by adding variations such as using different angles, incorporating props, or trying different entry points.