You never know what he had on unless you ask.

Myself, I wear Andiamo padded lycra undies under my cycling shorts. They are not like briefs, and could double for cycling shorts if they had a chamois. If you balk at paying more than $20.00 for cycling shorts like I do these will prevent any crotch wear from the cheap chamois they usually have. http://www.undyworld.mb.ca/ carries them and even with shipping they are cheap.

Or, he may have been wearing a pair of Andiamo padded briefs. You should have asked. Maybe you could have had a fun date out of it.