Ever look at someone and think “Damn, and you were the strongest swimmer??”🤣🤣

The environment of the reproductive tract is naturally acidic, designed to protect against harmful microbes.

But this also creates a major barrier — only a small fraction of sperms manage to pass through.

On top of that, the immune system treats these sperms as outsiders and eliminates many of them. From hundreds of millions that enter, only a few thousand reach the egg.