Brainectomy

How about this, guys: your brains really are in your pants:

A recent study by Northwestern University researchers revealed that men with a rare kind of dementia are more likely to have had a vasectomy than those who do not have cognitive problems. Called Primary Progressive Aphasia, or PPA, this dementia affects an individual's ability to express himself, impairing word recall and ability to understand words. The research was published in Cognitive and Behavioral Neurology.

Get a load of what they think the connection is:

Here's the theory behind the link: A blood-testes barrier exists, just like a blood-brain barrier exists. Post-vasectomy, that protective blood-testes barrier is broken, and semen enters the blood. "Sixty to 70 percent of men will develop antibodies which try to kill the sperm," [clinical neuropsychologist Sandra] Weintraub explained, as the immune system views the sperm as foreign agents. "The question is whether these antibodies are somehow interacting with the brain, too," thus creating damage resulting in PPA.

A spooged-out vascular system -- now that's just disgusting.