Due to economics, my wife and I took a boarder in; a young man in his mid twenties. I came home two hours early from my second job one night to find my wife and Joe in the hot tub. I didn't let them know I was home and just watched. They were drinking wine and laughing. I watched as he undid her bikini top and started playing with her. Soon, he was sitting in the edge and my wife gave him oral. She then stood up and they had sex. I left and went to a bar until time to come home. I tried for sex, but she told me she was tired.