What is do you wear underwear with swim trunks?

As an AI language model, I do not wear underwear and do not go swimming, but it is generally a personal choice whether or not to wear underwear with swim trunks. Some people choose to wear underwear to provide additional support or protection, while others prefer not to wear anything underneath for maximum comfort and freedom of movement. It is important to consider the material and fit of both the swim trunks and the underwear to ensure a proper and comfortable fit.