coit·o·pho·bi·a -- n. 

1. The fear of having sex.

Some of the main reasons for Coitophobia:  the threat of violence that seems to accompany much of normalized sex (or at least sexual fantasies) in the West, the fear of emotional blackmail, the fear of unwanted pregnancies, rape, all kinds of performance anxieties, just to name a few.

How to Have Sex in the Woods by Luann Colombo, Luann Columbo

Sex for One : The Joy of Selfloving by Betty Dodson