Only non BBC male can get this trait.
Character can gain this trait by consuming Elixir of the Black Womb
Character that has this trait will become slowly feminized after consuming BBC Cum from any of his orifices.
If wife is a cum slave, there will be a chance for her bull to come to your place looking for her, but if he can't found her, he will take the husband, if he manages to overpower the husband. The husband will realise how good it would feel and serve BBC as the sluts do, and this will turn the character bi, and start being Feminized
Random scenario for male, maybe spotting wife gets fucked, but getting aroused instead, that will give modifier if accepted, at 3 modifiers gain this trait. Refusing will lower modifiers and gain stress instead.
BBC that has court position, will actively seek white male to tempt him into becoming a Femboi
Elixir Concentration Game Rules for Elixir of the Black Womb