Don't know your town, don't know the market so this one may be way to risque for you to do. It's a type of reversal on the wet t-shirt that'll embarrass the guys and make the girls giggle. Need cash for 1st prize based on audience response. Call it the "Biggest Leprechaun Contest". Guys were briefs or boxers, your choice, and then get ice cold green beer pored down there. The green food coloring will make the tidy whitey's change color keeping you from being arrested but you don't have to allude to that in the promos, just the opposite. Of course where girls will expand in a wet t-shirt the guys will shrink in this one...thus the Leprechaun thing (get it, they are small little buggers). Girls will howl, guys will be embarrassed, should fit a CHR F18-34 pretty well and get you lots of water cooler talk all week.
If your market is in the Bible Belt forget it.