Verified answer

Well hooking up with anyone when in a relationship is considered cheating... Theres no difference between doing it with a girl or boy or even a tranny, i think it would only not count if it was a girl dog or something.

It's fine if you think it's fine. There's no rulebook on relationships. The terms of your relationship are between you, your girlfriend and anyone else you two choose to bring into it. You don't need anyone's permission to tolerate or condemn cheating.

I'd consider it cheating because the presence or absence of a penis isn't what defines being unfaithful in a relationship.