Previous studies have shown that the mechanism of interaction between sperm and egg cells is not related to the psychological relationships built between partners. People are known to take quite a bit of time to find out if they fit well, especially in their roles as parents of future offspring, BTA reported.
By analysing follicular fluid that surrounds the egg cells, the authors of the current study from the universities of Stockholm and Manchester found that eggs make a 'one-person' decision when choosing sperm. They are particularly 'picky' in this regard, as the primary responsibility in wear-and-feeding offspring falls to the female body, the researchers explain.
The egg selects her own mate
Human sex cells decide for themselves whether they “fit” or not, writes Popularnaya Mechanics, citing the results of a study by Swedish and British specialists.