Sleeping naked promotes intimacy among couples. Close contact with a significant other can massively boost the amount of oxytocin in your brain. This hormone is the neurotransmitter that helps you feel those impulsive good feelings to your other half.
A study from the National Institute of Child Health and Development at Stanford University found that men who slept in the Nood instead of wearing boxer shorts or briefs had a 25 percent lower rate of damaged DNA in their sperm than men who did wear them. Fertility may decrease as sperm gets overheated.