Well, transsexuals can be transmen and transwomen.
Transwomen, aka Male to Female, are women. This would make the women in question gay.
Transmen, aka Female to Male, are men. This would make the woman in question straight.
Things to remember...
The terms transmen and transwomen are referring to the mind, which is ultimately what the person will FULLY be at the END of transition. Many people confuse that and think it's the other way around.
Gay/Straight isn't just about sex, and people aren't just genitalia.
A penis doesn't make a person a man.
A vagina doesn't make a person a woman.
WHO a person is is what's important, and that's in the heart, mind, and spirit, Not in their pants.