It was seeing wild print, sexy bikini underwear in JC Penney catalog years ago as a horny kid of about 11 years of age. My Mom actually ordered them for me and I thought I'd never get over the thrill of wearing those silky bikini briefs. When I first got them I'd drop my pants every time I could just to look at myself wearing them.
I did something for the first time in many years a couple of days ago. I spent the night with a friend in my private bedroom there was a small pile of clean folded laundry in which most of the items belonged to a guy. On top was a older faded pair of Hanes Signature classic white briefs. I didn't think to at first, but when I went to get dressed right before I left I didn't resist the urge. I swiped the briefs, put them on under my new jeans and cowboy boots and left. The stiff ribbed fabric felt incredible against my slightly swollen, horny cock. Since I've been home wearing this guy's briefs I jacked off three times in them. My cock and nuts rest where some other horny guy's did.
Hot thought.