Horror at least had an excuse. Sex was basically used to prime people for excitement. It's a cheap trick to hijack our physiology and increase tension so movies

Horror at least had an excuse. Sex was basically used to prime people for excitement. It's a cheap trick to hijack our physiology and increase tension so movies didn't have to work as hard to be actually frightening. Old slasher movies were calculated to include nipples (usually shortly before something scary happens) and new horror movies are calculated to be inoffensive. I still prefer horror to be a bit gratuitous though. Psychological horror doesn't really need it, but if there's gore it does seem somewhat incomplete without a little sex thrown in.