Indeed, I think some sick twisted female invented it to be honest...(flashback to the labs in California ten years ago)
"I will make a pill that allows guys to carry a boner for so long, that sometimes it never goes away!"
"Why would you do that?"
"Because most of them are obessed with sex anyway, so let's see how they handle it when they can't relieve themselves at all!" (insert evil laughter here)
"See and you wonder why you never will win the Nobel Peace Prize."