“The chemical signals released from eggs allow sperm to change their swimming behavior,” Fitzpatrick said.
“Sperm swim straighter and move towards the egg when they are exposed to the chemical signals.
Based on the new findings, a woman’s eggs use those signals preferentially, to better attract sperm from certain men.
The researchers arrived at that conclusion after studying samples of sperm and follicular fluid from couples undergoing infertility treatment.
It turned out that follicular fluid from any one woman was better at attracting sperm from certain men, versus others.

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