Yes, the ratio at birth is fairly even but men go to war and have accidents. And a big percentage of them are actively and publicly gay. The percentage of straight college educated men is less than the college educated women.
Then you have the fact that women tend to marry up, e.g., taller, better educated, more affluent, higher status, older and you have a problem for many women. Female college basketball players have a small pool to pick from.
Then there’s the Bell Curve