I love when a guy's balls slap my p**** or chin while he's pumping my p**** or mouth during sex.
I knew someone who used a ball stretcher so his balls would hang lower and swing more, and his balls used to slap me really good. Sometimes we'd do it while he was wearing the ball stretcher and they'd be stretched tight against his skin so I could literally lick his balls like an ice cream cone while he masturbated and blasted his load all over my face.
I love a good pair of balls, the lower hanging the better. I love sucking balls, licking balls and slapping them back and forth so they swing. So hot.
I like it, lol. Something hot and animalistic about it. And of course it feels great, so that overrides any potential awkwardness for me. Balls are great. =D At the very least, we just get a little giggle out of it, haha.