Sex is often part of horror movies for a few reasons. One, it's still "taboo" and especially is used to, as the stereotype goes, justify someone to then be killed by the bad guy. Two, it's a limbic system, lizard brain sort of action. Just like fear. It helps reinforce a subconscious element of being reduced to one's basal instincts. Three, it's a vulnerable activity, and helps reinforce that aspect of vulnerability. Four, people like to see boobies. September 30, 2020 at 11:51PM