More produce sperm
More on sperm
Sperm counts Includes explicit content Updated Friday 1st March Getting to grips with the numbers behind the man's part of the reproductive system.
Additional information Article last reviewed by Tue 14 November
Messenger Sperm differ markedly in their swimming performance.
While infertility is not always treatable, it can sometimes be improved with a healthy diet, supplements and other lifestyle strategies.
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His mouth parted slightly, and a light sheen of sweat formed on his upper lip.
"At the last training session, they told me to not give up.
" I giggled at that, wondering if he knew from experience, and started down the walkway.
He picked me up princess-style and carried me down the hall.