That's not how it works dude... They probably thought they were lesbian but they found out that they weren't after they had sex and fall in love with a guy. They were bisexual in the beginning. not lesbians. Just because a bisexual person haven't experienced sex with opposite gender yet ( orexperienced it but simply not find the right person who can enjoy having sex with), that doesn't mean they aren't bisexual. If you are a lesbian, you are a lesbian. You cannot convert yourself a straight-bisexual. If you love the D and enjoy having sex with men then you weren't a lesbian in the first place, you just think you were. It's especially normal for Alex because it's hard to find a boyfriend with his dad is mafia leader and all. Izzy was the easiest and perfect choice for her before meeting with MC. Anyways I think both of the girls loves dick more than pussy now lol. The sad thing is, we probably have to choose one of them at the end of the game I feel like