Anal Pleasure -

Anal pleasure is a common form of sexual exploration rooted in the complex network of nerve endings found in and around the anus. While often considered a taboo subject, studies suggest that roughly 20% to 50% of people have experimented with some form of anal stimulation. Why It Feels Good

The pleasure derived from anal play is primarily biological. The anus and the anal canal are packed with sensitive nerve endings that are interconnected with pelvic muscles and the genitals. Women's techniques for pleasure from anal touch - PMC - NIH anal pleasure