Smallpox -- it's not just for destroying entire indigenous peoples now. You can also get it from sex! Yep, there's now a new terrifying science fact about getting down: You can catch your lover's vaccinations through sex.

A woman in Washington state found she had contracted the vaccinia virus used in smallpox vaccines after having sexual contact with her boyfriend, a member of the military who had recently been vaccinated for the disease. She's one of five recent cases of women who have contracted the virus via sexual contact with military members. The woman's horrifying symptoms included ring-shaped vaginal swelling, sores and swollen lymph nodes. The vaccine isn't typically dangerous to healthy people, but can cause problems for those with compromised immune systems. (NYTimes)