I'll see your Lorena Bobbitt, and raise you an Amanda Monti. Sounds like a bad urban legend (though I trust this site implicitly), and like most UL's there's a moral to be had. In this case you (1) Don't go back to your ex's, (2) drunk, (3) wearing only your underwear.
Going to a party: $2.00
Drinking at the party: $5.00
Going back to your ex's: $2.00
A botched vasectomy: Priceless
Now, since I've heard that English prisons have retained personal trainers, as incarceration reduces serotonin, and creates a poor self-image, I imagine her tai-chi instructor's command to "imagine a sphere in your hands," will have a whole new connotation...
