Taking his medicine.

Dennis did not start regretting robbing the old lady on her way back from the post office who shouted strange things at him as he ran away until he discovered himself transformed into a woman with a very peculiar dietary need.

As he discovered to his horror he could only be satisfied by the seed of men.

So no matter how much he hated it and found it disgusting he now had to have a daily dose or he would go sex crazy and practically screw anybody with a dick which left him no time to find the old lady he had robbed to beg her forgiveness.