My tastes never truly expanded.
I'm into "clothed bondage" with absolutely no rape nor sex and it's very hard to find other people with the same fetish as me. Even if I find dedicated bondage artists, they still at least expand a little to something more explicit but I can never seem to do that. I don't consider it a "mental block" or anything.
That's just my fetish: "PG13 bondage".
The only reason I dive into hentai is to look for instances where a girl is bound but still clothed and the sex hasn't started yet. Dojinshis, games or visual novels about clothed bondage exists but are scarce.