Bad move, dude.

The events unfolded on Saturday night, after the pair had been arguing over an impending break up, an Anchorage Police Department statement said. At some point, the two decided to have sex and the man agreed to let the woman tie his arms to a windowsill. But the woman used a kitchen knife to amputate her partner's penis and flushed it down the toilet, police said.

Dude really should have been more careful...