I don’t know if you care but applying heat to the balls can and will kill your sperm. You wont be able to have kids until a few weeks after you stop applying the heat. That might be a good or a bad thing depending on the person. I saw an experiment some guys did a few years ago where they sat with their nuts in a bowl of hot water for 20 minutes a day and had their sperm count tested. After about a month their count was low enough for them to be effectively sterile. The effects went away after some time but heat and sperm don’t mix.

Sorry I tried to find a link about this but could not, maybe somebody else could. I think I saw it on he discovery channel.

When I was 5 years old my mom told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down "happy." They told me I didn't understand the assignment, I told them they didn't understand life. ~John Lennon