i think that it is right because it control our testes and stop ourself to do sex.
ANOTHER ANSWER
I have never heard of “improved sex” by wearing tight underwear. However- it does have an impact on sperm count. The scrotum is a natural “thermometer”. When cold, the scrotum will bring the testes closer to the body. When hot, the scrotum will relax and hang lower to cool off. This is because semen need a moderate, constant temperature. This is why if a man is trying to get his wife pregnant, a doctor will recommend boxer shorts so that the scrotum can do it’s natural job and keep the semen at a regulated temp. If a guy always wears tight underwear, it throws off the natural temp, and will result in lower sperm count. Hope this answers your question! <<>>