Airstrip One
Completely Effed
http://en.wikipedia.org/wiki/Oral_sex
Oral sex is correlated with reducing the risk of miscarriages by inducing immunological tolerance to the proteins in sperm, a process known as paternal tolerance. While any exposure to a partner's semen during sexual activity appears to decrease a woman's chances for the various immunological disorders that can occur during pregnancy, immunological tolerance could be most quickly established through oral introduction and gastrointestinal absorption of semen.[32][33] Recognizing that some of the studies potentially included the presence of confounding factors, such as the possibility that women who regularly perform oral sex and swallow semen also engage in more frequent intercourse, the researchers also noted that, either way, "the data still overwhelmingly supports the main theory" behind all their studies—that repeated exposure to semen establishes the maternal immunological tolerance necessary for a safe and successful pregnancy