Looks like that's exactly what you said...
"World culture?" Western Europeans don't get flummoxed about sex or nudity like Americans do in films, magazines, newspapers etc; . They DO object to graphic violence and American television is LOADED with graphically violent movies and television shows. Outdoors? Is it Jean's or yoga pants, or sleeveless blouses in warm weather that bothers a person? Do you want Women to be covered up from head to foot as is done in Moslem countries? What's next? Taking females of all ages off the streets and out of society confined only to indoor situations?
As for ISIS and even non terrorist groups, Afghanistan and Pakistan for example are NOTORIOUS for keeping females out of public and instead underage boys shop work, do the walking about that some Women would be doing. Tragically this makes these minors targets for sexual exploitation by older youths or Men. Afghanistan has an age old custom of training boys to dress, dance and sing like girls, subsequently, they are the entertainment for the Men's all male get to gethers whether they be casual right up to and including wedding after parties where the sexes do not celebrate together. Poor boys are sold by fathers as to bring income to the family.
As for Incels, they don't want prostitutes they only want what they want. The idea of the Nerd getting the hot chick is older than Revenge of the Nerds- the famous Peter Parker of Spider-Man fame starts off as a Nerd who gets superpowers and disdaining shy, intelligent, nice but not so knock out attractive girls goes instead after the hot chicks ie; Gwen Stacy, Mary Jane Watson, Felicia Hardy ( the villainess the Black Cat). Let me know when society toys with the idea of making Spider-Man UN popular!
They haven't been looking at "porn" but a "sexually lax" (whatever that means) "world culture" (whatever that means) and it's breeding resentment?