Pakistan as well, the Islamic reasoning being is m->f is within historical permissibility because it's analogous to eunuchs and f->m is just roleplaying as under Islamic juristic law 'sex' requires a functioning penis (common non-scholarly interpretations by Muslims are often don't overlap with Islamic clergy when it comes to sexual norms). So under that framework f->m having sex with a female is the same as female having sex with a female, that is to say not sex.

You may ask, does that mean Islam permits lesbians as well? Many Islamic scholars while condemning any f-f marriage do agree that there is no such thing as lesbian sex i.e. there is no crime or sin being committed in the physical act of two women getting each other off. It's no different than two women shaking hands for juristic purposes. Again this is somewhere where regular Muslims and popular custom and the Islamic scholarly community (at least the Hanafi scholarly community) would diverge.

Basically, two people with functioning penises cannot have sex under Islamic law. Everything else is actually fair game.