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The man's semen can be analyzed in a lab to see the viability of his semen.
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Yes. A tired man can still produce semen. It might take more effort but as long as he can put semen into a woman's vagina, she can become pregnant.
Yes, if the person is a "secretor" which means they secrete ABO blood group antigens in various bodily fluids (such as sweat, tears and semen). The type of antigen secreted in the semen, for example, corresponds to the man's blood group. A group A man will secrete A and H antigens, a group O man will secrete H antigen. Note that not everyone is a secretor- only 80%.
No, women do not produce semen.
Yes, fish can produce semen. Semen is the fluid containing sperm that is released by male fish during reproduction.
It is unusual for a young man's initial ejaculations to be as potent as they will be later on in life, though, and for many the semen runs clear
Women do not produce semen.
Woman do not produce semen.
They produce lethal burning semen out of their genitalia glands and glaze their enemy in burning man gravy
Yes, a 65-year-old man typically produces less semen compared to younger men. As men age, there can be a decline in testosterone levels and changes in the prostate and seminal vesicles, which can affect semen production. Additionally, factors such as overall health, medication, and lifestyle can also influence semen volume.
Only to a degree. If you have a certain size and they get smaller, you might have some fertility or hormonal issues. But overall, testicle size does not affect the amount of semen you produce.