People prefer to go without underwear for many different reasons, including supposed hygienic benefits and warmth issues. Aesthetically, some people find that the lines caused by underwear are unattractive, but that wearing a thong is uncomfortable. Men who go without underwear are often concerned about heat issues or may believe that wearing no underwear promotes fertility. Women often believe that not wearing it reduces the risk of some infections. Not wearing any is simply more comfortable for some people and need not be justified in any way.
One of the most common reasons people regularly refuse to wear underwear is for hygiene. In areas that are extremely humid, damp, or otherwise likely to collect moisture and heat around the genitals, skipping underwear can promote ventilation and cooling, keeping the area more comfortable. In addition to comfort, not allowing this area to sit damp for long periods of time can prevent the skin from becoming infected. One condition that may occur if underwear is left damp for too long is commonly known as jock itch, and it can be a major annoyance.
Women often find that there are conflicting reports about whether or not wearing underwear is sanitary, but many women have been told not to wear it at night in order to allow the genitals to breathe. This supposedly reduces the chances of getting a yeast infection or vaginal itching problems. Many women were simply brought up to believe that wearing underwear at night is abnormal, so they continue to do so out of habit and personal preference. Even when a person does not explicitly shun underwear for hygienic reasons, there is often a hygienic root at the heart of the decision.
Some men often choose to go without underwear because it is more comfortable. For many men who wear boxers already, going without is not very different from their normal clothing items. Some cultures have specific items of clothing that do not involve underwear, such as kilts, and so men sometimes choose to not wear it for traditional reasons. Many men choose to sleep without underwear or use their underwear as pajamas, often for comfort.
Most people who don't wear underwear simply find that not wearing this article of clothing in certain situations more comfortable. Some people report that they feel sexier when not wearing undergarments, but this is usually not a motivating factor. Fashion may play a role in the choice to wear nothing beneath tight fitting clothing, but special undergarments are typically considered more appropriate. There are many reasons to not wear underwear, but each person typically has a unique argument against this clothing item.