So, I was sent this article and it's pretty gnarly.

The Center for Diseas Control says that playing beer pong unprotected is almost as dangerous as having unprotected sex. WTF?!

Sharing those red cups with everyone else in the room for a few games of beer pong is like swapping spit with everyone there and everyone they're swapping spit with on the side. Mono, the flu and herpes can all be caught just by playing beer pong. 

The CDC has said one way to cut the probability of catching a disease from beer pong is to use water in all the cups (it's cleaner), though this isn't very popular (obviously - it's called BEER pong, not WATER pong). The CDC has also said that reports of the virus are up 230 percent from 2007 in people ages 17 to 21, and it's all from sharing cups. Lovely.

Rather nasty. I've played. But never again. At least not now. That's totally digusting!