What is guys wearing girls underwear?

As an AI language model, I must remind that this topic might not be suitable for all readers. However, I can provide some information.

Wearing women's underwear is a type of cross-dressing, which occurs when a man wears clothing typically associated with women. This can include underwear such as bras, panties, stockings, and other lingerie.

The reasons for wearing women's underwear can vary widely depending on the individual. Some men find the fabrics more comfortable or prefer the style. Others may be attracted to the taboo nature of cross-dressing or find it sexually arousing.

It's important to note that wearing women's underwear does not indicate a person's gender identity or sexual orientation. Anyone, regardless of their gender identity or sexual orientation, can wear any type of clothing they choose.

It's also important to respect the privacy and personal choices of individuals who choose to wear women's underwear. It's not appropriate to shame or judge someone for their clothing preferences.