>>88755576When it comes to futa-on-female there's two main draws:
1. It allows for porn where a woman takes dick, but doesn't involve a guy. I'm a guy who generally can't get into porn with a guy if he doesn't look like me or is unattractive (and a lot of porn is faceless/ugly fat guy fucking some woman). Futa-on-female is like lesbian pegging, but with sensations associated that guys can empathize better with.
2. Futa porn, being overwhelmingly 2D/drawn/fabricated, can incorporate other fetishes well. I have other fetishes that click pretty well with futa-on-female. Of course, a lot of that crossover is anthro/furry shit, but I wade through it for the good stuff.