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  • 11/4/2025
Explore the fascinating dynamics of human fertility and the complex factors that influence pregnancy probabilities in our latest video! We delve into the likelihood of conception during a sexual relationship without contraceptives, revealing how the chances of pregnancy can range from 0% to 9% depending on the menstrual cycle, with an average probability of around 3%.

Join us as we analyze a hypothetical scenario where a man engages in 100 sexual encounters over a year, potentially resulting in three pregnancies. However, this estimate from Cordelia Fine's "Testosterone Rex" simplifies many factors, including age-related fertility issues and chronic infertility, which affects about 8% of women.

Discover the impact of declining male fertility, with sperm concentrations dropping significantly in recent decades across North America, Europe, Australia, and New Zealand. We also discuss the challenges of achieving higher pregnancy rates through traditional intercourse, and why focusing on ovulating partners is impractical due to the lack of overt signs of ovulation in human females.

Whether you're curious about reproductive health, men's fertility, or the science of conception, this video offers valuable insights and thought-provoking discussions. Don’t forget to leave your thoughts in the comments and subscribe for more engaging content on human sexuality and fertility!

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