Plays for the other team
One who "plays for the other team" is gay.

Basically if someone were to say "she plays for the other team" it would mean she plays for women who like women not women who like men. It's an expression to say someone is gay men (They don't really have their own term to my knowlage) plays for men who like men or Nb who like men, lesbian plays for women who like women or Nb who like women, or skoliosexual plays for nbs that like nbs, or nbs that like men/women
"I have a crush on Ivan"
"Sorry, it's not gonna work out... He plays for the other team"
"Oh well that's too bad"