Actually, she's lusting after some dude who was name-dropped in Raidy 2. Some schmuck named Dean or something, whatever.
She just gets targeted by raging lesbians all the time and has to beat them up for lezzing a bunch of town girls who don't want to be lezzed. And then she started accepting her bisexuality from all the lesbo-sex-punishment she inflicted upon all the lesbians.
tl;dr: Raidy has no problems fucking dudes as well.