DEAR ABBY: Our 22-year-old son stays with us. He has a part-time job and goes to school part-time. He is somewhat secretive. We don’t know his friends or where he goes. One day he brought a male friend over and they hung out in our guesthouse, drinking and playing video games. This went on for several hours and then the blinds closed. My husband wasn’t comfortable with that, so he knocked on the door and went in to talk to them. He asked the friend if he had a girlfriend, and the friend said no — that he’s bisexual. Our ...