Dotei Yankee Magicus 01-03
The first page of the manga informs us that if you are a virgin at age 20, you might be able to start using magic. We then cut to Tatsuya, walking home from the convience store alone, counting down the seconds to his 20th birthday. Then, a talking cat appears, and transforms him into a beautiful idol, who exerts pheramones to all nearby men, and he can only transform back to his original body by _______. You see, the talking cat is actually an alien, and while he claims he needs ________ to be able to return home, he actually has entered Tatsuya into a world of Mage Battles with virgins who have formed bonds with talking cats.
I was shocked at how explicit this was based on where I read it.