Simply answer: Wearing underwear can protect privacy and hygiene, be more comfortable, play a role in hiding shame, beautify the hip curve, and have the function of heat dissipation.
Protect privacy and hygiene.
Because people's privacy is easily infected by bacteria, if they don't wear underwear, their genitals are also easily infected, so they should change underwear every day.
Shameful effect
If women wear skirts without underwear, it is easy to be naked, which is really embarrassing, so wearing underwear also has the function of hiding shame.
comfortable
Because the fabric of trousers is very hard, we will be comfortable to wear a pair of soft underwear, and it will not rub our private parts.
Beautify hip curve
Wearing underwear can also beautify the hip curve. Old women's genitals are prone to droop, and the curve is very unsightly. Wearing underwear can avoid this phenomenon.
dissipate heat
Because the fabric of pants usually doesn't stick to the skin, wearing pants directly will make you feel uncomfortable, so wearing underwear can play a role in heat dissipation.