system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are ALL (except equestrian) Olympic events single sex?

I understand, I think, events like swimming, gymnastics, weight-lifting, etc.  Why do events like fencing, badminton, archery, even basketball, have to be single-sex only?
gpt
Because men and women are built differently and have different athletic abilities. So to keep things 100% fair men compete against men and women against women so that the only X factor is skill, not gender differences.