I could have sworn there was a "prefers anal only" trait for females?

[Oven-toasted-owl]

or am I imagining wrong??

[Blastik1]

There is the "anal addict" trait (from Nisa's WP mod I think), I'm not aware of an "anal only" option though.

 

I've found that WW has a pretty deeply layered options menu, so the option you speak of may well be in there somewhere, but I've never seen it when messing around with the options myself.

[Yotix]

There's anal options in a  mod called WickedPixxel - Sexy Gigs Mod