Semen is a bodily fluid that is secreted by the gonads... During the process of imprenation, the semen is ejaculated from ...the friend, into the best friend's wife. She never should have let that happen, but since it did, it would be imporant to note: that a Dutch study of women who gave head and swallowed.

The researchers found that swallowing sperm helped adapt the mother’s immune system so that it could accept the foreign proteins present in sperm,

Research has also shown that some women are infertile or miscarry due to the presence of antibodies that destroy the proteins or antigens present in their partner’s semen.

But this wouldn't happen to her now that she'd lost the bet and swallowed.

That was before this later wager:

No condom and NO pulling out!

Giving oral sex and swallowing your cum may likely help make pregnancy safer and more successful!

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Fuck!

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This is meant to have an inherent risk of her getting pregnant. No attempt should be made to convince her of less risk; infact, the oposite, you might choose to taunt her about the potential risk --that she might very well end up pregnant.