Sexy sperm

With every ejaculation, men produce around million sperm cells. How much do you know about these wiggly little cells? Read on for 7 surprising facts about sperm. Want supercharged sperm, or just a nudge to the slow guys?
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Does sex every day reduce sperm quality?

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Can I get pregnant if I have sex without penetration? - NHS

Moreover, post hoc analyses revealed that these sons produced significantly larger ejaculates when second to mate, despite being smaller. Multiple adaptive hypotheses exist for polyandry and may be divided into those in which the female directly benefits through her own enhanced fitness i. Further constraints include the nonadditive nature of genes e. Sperm competitiveness in this species has been shown to be contingent upon parental compatibility i.
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Can I get pregnant if I have sex without penetration?

Kathryn B. The sexy-sperm hypothesis proposes that polyandrous females will have a selective advantage over monandrous females as their sons will be sired by males with competitively superior sperm and will inherit this trait. Although the good-sperm hypothesis also predicts that offspring will be sired by males with competitively superior sperm, it additionally assumes a positive correlation between offspring sperm quality and the general viability of both sons and daughters.
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Back to Pregnancy. Yes, although the risk of getting pregnant in this way is very low. If you want to avoid getting pregnant, you should use contraception. A man's semen the liquid produced when he ejaculates or "comes" contains millions of sperm. One ejaculation can contain more than million sperm.
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