When Randy gets caught cheating on his near-frigid wife Donna, an angry witch punishes him by cursing his wife with a penis of her own. This penis will go away after a month, but only if Donna can resist pleasuring herself. The only thing is, this particular appendage comes with its own lusty appetite, and has a unique way of inspiring willingness in others, even a very homophobic Randy. Will Donna be able to control her new rampaging lust? Or will she succumb to the desire to dominate, not only her husband, but their pretty young neighbour, her bitchy co-worker, and even their closest friends?