Genetically engineered man-hoes

Progesterone receptor KO in mouse have been done a long time ago. We know they make infertile females that can't ovulate. But nobody had bothered to take a good look at the males since progesterone is not really our thing. Although their general morphology is normal, these males seem to be sex fiends. PRKOs showed a significantly reduced latency to mount and increased likelihood of achieving ejaculation, increased mount and intromission frequency and decreased latency to intromission. These guys are doing it more and without breaks. So if anyone is interested I've got a stockpile of RU-486 in the freezer for 50$ a pop.