I wouldn't have a problem with a person being deaf if I found them attractive and they had a good personality. The peace and quiet around the house would be welcome at times.
He probably let them feel his stomach because he was a bit flattered by the question. Most people have to work out A LOT to get a six pack. He probably didn't think anything of it and then when they took it too far he backed away. If he had any intentions of hitting on your daugther it would have happened right then. Most men don't bide their time and wait for the kill. They rush right in guns blazing.