I have a very successful-with-girls friend that is an average piano player.
This is what he does. He meets someone, goes out in a date, and eventually get back to his apartment. He has a keyboard right next to the sofa, so of course the question "do you play piano?" ALWAYS comes up. He says, well kinda, and the goes to play a highly emotional piece. This always ends up in sex.
He always tries to get them to go to his apartment, even if its for a minute before going out to a date, so that this happens.
Music is the great aphrodisiac.
Also, he considers himself a great piano player and he is NOT MODEST ABOUT IT, although he is borderline capable. 99% of girls eat it right up (except those musically talented).
Actually, this works so outstandingly well that I'm learning to play the piano. Almost anyone can play the guitar. The piano, that's a rarer talent, I believe.