Fellatio may reduce the risk of miscarriages by inducing immunological tolerance in the woman by exposure to the proteins in her partner's semen, a process known as paternal tolerance. While any exposure to a partner's semen 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 the oral introduction and gastrointestinal absorption of semen.[31][32] Recognizing that some of the studies potentially included the presence of confounding factors, such as the possibility that women who regularly perform fellatio 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.[32][33]
As I mentioned in this section in Chapter 2 of the Blow Job Guide, the tip of your man’s penis (the glans) is by far the most sensitive spot on his penis, particularly the underside. The female equivalent is the clitoris. So focusing your attention on the tip of his penis is going to work well to push him over the edge in the most intense and pleasurable way possible.
Cultural views on oral sex range from aversion to high regard.[1] It, especially fellatio,[34] has been considered taboo, or at least discouraged, in many cultures and parts of the world.[1] Laws of some jurisdictions regard oral sex as penetrative sex for the purposes of sexual offenses with regard to the act, but most countries do not have laws which ban the practice itself, in contrast to anal sex or extramarital sex.

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