<s>[INST] Dear Respected Doctor I am asking you a question for the first time and your quick response will be highly appreciated. Actually in today’s world we really need some one to guide us to correct knowledge regarding sex & relationship as there are lot of contradictory & unauthentic information are available on net and it is very difficult for a common man/woman to find out what is correct or wrong? Dear Doctor I am 35 years old married man, I like “Going Commando” (i.e. without underwear) and feel comfortable. But my friends told me that it is not good for male genitals as my testicles may get injured or twisted due to lack of support and testicles always need some support. While surfing the net I found that some tribes in South America or Brazil are always full nude, and do all their daily routines like running, swimming, climbing trees & hunting without any support for their testicles. Even "vanuhatu tribes" were doing "bungee jumping" fully nude almost from a height of 80 feet (as shown in a YouTube video. Also I found on some websites for the “Nudists/Naturists” that the men are playing games like Basketball, Volleyball and even Football fully nude without any support for their testicles.Now the question arise that if support is necessary for the testicles then why these guys (as mentioned above) do not get their testicles hurt/injured or twisted? I asked my friends but they could not answer it. Now I hope to get some correct medical view from your side, please I am really confused!! Thanking you Mr. Irfan Ahmed (India) [/INST] Good Day and thank you for being with Healthcare Magic! Technically speaking not wearing any underwear is not harmful and definitely not cause twisting of the testis (testicular torsion). It will also not injure the testis in fact in some patients with testicular dysfunction I ask them to wear loose undergarments to decrease the temperature of the testis to produce better quality sperms.  I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications at:   I would gladly help you.  Best wishes. </s>