If you read Luke 10 where they have the parable of the good Samaritan, Jesus himself uses that parable to explain who your "neighbor" really is. The idea is that you should love people who love you, and not pour your love on people who wouldn't help you when you need it. I don't know what happened in the past, but we've had this bastardization of the lesson pushed on everyone to love everyone all the time. This is stupid and clearly not the point of the message. And it just goes to show you that people don't think anything through. If you look at sleeping around, you know the sin, because it leads to all sorts of potential problems. Yet loving people who don't care about you, or even hate you, could end up causing you far more trouble than screwing around with strangers.