Can be rewarding but frustrating. I fell in love with this gorgeous young Swedish guy, who admitted he was bisexual and living with his long term girlfriend. We had the most amazing sex, but were only able to meet twice a month. In those brief hours, we would strip naked as soon as he arrived, and I would soon be fucking the cutest ass you can imagine. I knew he would leave with some of my spunk inside him, but then go home to fuck his girlfriend. It lasted for over,4 years, but eventually the frustration won out and we agreed to part. No regrets, the best sex I've ever had.
