"The Queen of Terror has been sealed away inside of Satou Kohta's balls in order to prevent her from wreaking havoc around the world. However, all is not well in Kohta's pants. A devil named Elyse has been sent to Earth to release the Queen from her unusual prison - at any cost. Elyse only has 30 days to make Kohta ejaculate in order to free the Queen. The future of mankind rests...on Kohta's balls." - Anime News Network
Can you believe this manga is only released once per month? I can't. It's pure genius. And by pure genius, I mean it's the stupidest thing I've read in my entire life. Totally stupid, but hilarious. You can't go wrong with the premise of a girl forcing herself on a guy who for some reason must resist with all his willpower. It worked for beautifully for DNAČ (but only for the first half of the series).
I really don't know what else to say. Believe it or not, I haven't seen anything quite like My Balls. It's not much like Ippatsu Kikimusume, but I imagine if you like one, you'll probably like the other.
Finally, I'd like to stress that My Balls is a comedy. Sure, there's a lot of nudity and sex, but it's comedic, not erotic. If this stuff turns you on, you've got issues.
UPDATE: Holy shit! This actually was done by Shigemitsu Harada, the brilliant mind behind Ippatsu Kikimusume. In fact, according to Anime News Network, Ippatsu Kikimusume was the only other manga he's done. I am so impressed with myself for making the connection, I think I'm going to watch some Ninja Warrior.
Just in case the Queen of Terror is sealed in my balls, I haven't had sex for 187 days