A: There’s a famous case of a 15-year-old girl who was born without a vagina—but with everything else—who managed to get pregnant via oral sex. Well, via oral sex and a knife fight and a life-threatening wound that allowed the spermatozoa in the girl’s gut to swim into her uterus. This—according to a friend-of-a-friend who knows someone who was there—is not an urban legend. In fact, the story appeared in a 1988 issue of the British Journal of Obstetrics and Gynaecology and bounced around the blogs for a few weeks last winter after a blogger at Discover unearthed it.
Anyway, BSIC, the moral of the story: Never say never. But provided your husband swallows and doesn’t gargle, and provided there isn’t any semen dribbling down his chin, I’d put your chances of getting pregnant under the circumstances you’ve described at pretty darn close to zero. (And not to ruin your day/three-way or anything, but you do know that vasectomies have a 1-in-2,000 failure rate, right? If you do get knocked up after one of those three-ways, BSIC, the bonus baby could still be your husband’s.)