I think its abit like bdsm, prior to 50 shades most peoples reaction when they first encountered it was some version of “thats not for me”. Now its alot more mainstream, many people feel free to give it a go and are discovering they really enjoy it.
I think the truth is its very dificult to know what you’ll like until you try it. After all, i never thought id be into anal play. Now have butt plug collection 
Think its partly cultural too. In places like japan, monster girl and tentacle porn are really popular and basically mainstream. Gotta love a country where having a shelf of hentai books on display is fine.