You are not interested. Obviously, some will be more convincing than others. Sometimes the urge for sexual satisfaction is quite powerful we can lose our inhibitions. I think that I look pretty convincing. You are currently in a relationship with a girl, and you discover that there is a guy that has strong feelings for you.
I strongly doubt it.
Have you ever thought about dating or having sexual relations with a member of the same sex? Matt Damon is a very talented actor who has been in all sorts of movies. Denial is a very powerful force.
Likewise, a guy could wear a dress, apply some makeup, and put on a pair of high heels.