What usefull purpose, exactly, does underwear serve?
It is your first line of defense against skid marks in your everyday clothes. 
One word: absorbance.
[Moderator Hat ON]
Normally I’d toss this over to GQ to give manny a hard time, but I think I’ll get more entertaining responses in IMHO. 
[Moderator Hat OFF]
what else would you attach pads to? They also help catch first day accidents
I take it my85car, that you are a woman. No man who has ever pulled up his zipper in a hurry would ever ask such a question.
My question is, why, knowing this, do some men still not wear underwear?
If you wear it to sleep, you might not have to do the sheets so often.
Think about it.
I’m surprised nobody else hinted at this yet…My underthings keep my bag from sticking to my leg.
It keeps the package all in one place. I do own boxers and they don’t have a basket but there’s enough fabric down there to interfere with the infamous scrotum stickum.
Thank goodness cats don’t have to worry about underwear.
My person has a very good reason for wearing underwear everyday now. She was wearing a fairly thin pair of kakis, but no underwear, at work one day. She went to a client’s office. She tried to slip trough a door that was closing and caught the seat of her pants on a very small but sharp piece of metal sticking out from the door. And, to top if off she didn’t notice the hole until a friendly stranger pointed it out to her.
People should always wear underwear!