Well I'm infatuated with balls. To me they're the sexiest attribute of the male body and mine like to get a lot of attention, being stroked, kissed, sucked, squeezed, pulled down... you name it, as long as it's done gently, of course (not into ballbusting or BDSM).
But the absolute best is when I'm barefucking either a girl's pussy or a guy's ass, looking straight into their eyes, their legs on my shoulders o wrapped around my waist and they reach down to cup them and pull me deeper inside as I climax. I guess it's a combination of both the physical sensations and the symbolic connection with my partner, as if they were non-verbally expressing their primal desire to get my fertile seed diectly from my testicles right inside their bodies.
Man, I'm so hard and already precumming just by typing this! Gotta rub one out...