A Slip in Uranus

Dan Peters survives a road traffic accident as he sets of to work on his bicycle. The vehicle that hits him takes him to a strange research lab where Dan finds himself on a hospital bed.
Here Dan finds that the world has been hit by a large meteor shower. Apart from the damage caused by the meteors, they also brought with them something more destructive. A virus. A virus that i wiping out all of mankind.
There is some good news for Dan, though he might not be too willing to share the good news. He carries the cure. The downside is, it is in his semen. Worse, it can only be administered anally.
Is Dan up to the challenge of saving mankind?
Well if you don't know I certainly don't. i have a few ideas on where I'm taking this but anything is possible.