* Fewer sexually attractive/adequate ("screwable") indviduals than decades ago. For example, many people who have the genetics to be attractive will get obsese or overly tatted/pierced/etc.
* People expecting all sorts of silly criteria for compatibility. ("Must enjoy hiking. Must be a Democrat. Must have a dog.")
* Technology serving as a proxy for real-life sexual dynamics/validation. Maybe getting 100 Instagram Likes is equivalent (in terms of chemical reactions in the brain) to getting hit on by 1 decent looking guy at the bar. So if you're a woman who can sit at home and make an Insta post and get a couple hundred Likes (this is any decent looking woman), no point of dressing up and going out the bar on a Saturday night.
* Men and women don't need each other as much for reproduction, because of technological advances like the pill and vitro fertilization and such. Currently, reproductive technology has done more to damage men's sexual power than women's, but once artificial wombs are developed this will reverse and it's unclear how this will effect women in society but some of the speculations by thinkers like George Gilder are quite scary.