My underwear collection includes 8 pairs that are worn out, holed, or don't fit but were faves from the past that I just can't throw away.
I prefer briefs to trunks or shorts. I've also kept all pairs from a mate I used to swap briefs with each time we threesomed a GF of his or of mine.
Do you have faves, and do you find yourself attracted to guys in locker rooms by their underwear?