Unlike blue balls, red balls occur strictly BECAUSE one is engaging in sexual intercourse. Most often the result of going balls deep in a menstruating woman. If this occurs during a non-menstrual cycle, stop having sex with little girls and/or seek medical help immediately.
Yo, son! Last night I was banging this chick, but she didn't tell me it was shark week. I woke up and I had red balls. Damn, I should have been on the discovery channel.