Let alone wear undies that offer no support or separation...
http://themetapicture.com/wearing-boxers-on-a-hot-day/
A few weeks ago My cousin from Europe came to visit. She went swimming everyday and I was bound to wind up in the pool one of these days. For the sake of everybody I bought a pair of shorts (as all of my existing ones are like 10 years old)... Swimming in a pair of boardies the first time in 6-8 years was definitely a unique experience. Yuck! My balls stuck to my legs (Einstein should have worn a speedo underneath) and it was heavy as hell for a swimsuit. No bueno. I will not be doing that again for a long time.