"Mmm... This is strange" said Mary as she picked up the "gender vial". "I don't think this transparent liquid do what I think". (she thinks that the gender vial will increase the beauty of the gender making it more sterotyped, for example, if a man drinks it, it'll make him a true hunk with great muscles, and viceversa with the women)
"well, i doubt this will work, but i'm not losing anything, so here i go" said Mary drinking the vial. "ugnh it tastes sour".
Minutes later, Mary goes to bed feeling slightly dizzy. "I hope that thing wasn't poison" was her last though as she fell asleep.
The next morning...