Since I was 6 I don't wear underwear. I used to sneak into the bathroom before the sports(P.E) lesson back in school to put on a underwear. This is because I didn't want other people in the changing room to notice! After the lesson I took my underwear and put it back in my bag. I usually wear underwear when im going to a place with a public bathroom...
Ofcourse I change my pants everyday because I dont wear underwear. By the way im a guy.
Ofcourse I change my pants everyday because I dont wear underwear. By the way im a guy.

Because their peckers are on their heads.
I wouldn't risk going without it.
AHA! So you DO wear underwear! 2 negatives ("don't" and "no) cancel each other out. ;)
I enjoy not wearing panties.
I feel my free, like my private can breathe better =] haha.
I like to make sure I wear them when I wear jeans though.
But pjs, skirts, exc it feels lovely not to wear them!
Hard manual labor draws much need for underwear, as your stuff will get very raw against the jeans!
Which, admittedly, has led to embarrassing incidents with broken zips and ripped pants. I once had to walk all the way from work to home in the middle of the day holding up trousers with no way of fastening them and no zipper.
Although not wanting to be a traitor to the cause, I'll probably wear underwear again when I'm with someone. I think women kind of expect it. :/
I don't think women expect it, but it is an "oh" moment when you come across someone who doesn't.