I googled up some info and just think it's really interesting.
If you don't want to click the link, it pretty much explains everything about sperm. I thought these parts were really interesting.
They swim about 8 inches in one hour. To do this they need to wave their tail about 16,000 times!
Sperm swim vigorously in the direction of various female hormones. This is what guides them to the egg. The attraction is called "Chemotaxis".I thought the chemotaxis thing was super interesting. Always wondered how the sperm knew where to go lol.
The chemotaxis attraction is extremely strong. In lab tests, even when the extract of these female hormones was diluted 100,000 times, the sperm still swam toward it!
I wonder if scientists are trying to determine if that still happens w/ maybe women whose ovaries don't work? Or well, aren't working as they should.
Another link that talks about it some