When my futa character has sex with female slaves and they lack the bisexual and/or homosexual trait, they occasionally say they're not into girls. Doesn't matter what gendered body part is involved it seems, and maybe I'm missing something here. I had a character be bisexual, then lose that trait after an interaction which to me implies that the game took my inputs as male, but once that trait is gone I'm called out for being the same gender which... I dunno.
