Coitus positions

Here are three popular positions I adopt when receiving a penis.  The receptive partner must ensure that his anus is easily available to the inserting partner.

Doggy Position

Probably the most popular position.  The receptive partner is on hands and knees with his anus lifted and his legs spread.

Missionary Position

Although primarily a position for penetrating the vagina, it will also work for anal penetration.  The receiving partner lays on his back and rolls his knees up to his chest, so open and lift his anus.

Side Position

A modification to the missionary that makes the anus easier to penetrate.  The receptive partner lays on his side with one leg raised and pulled back.