Just like women dominate in knitting. It is an activity that nothing to do with gender, but it's taught socially only to women.
So, does that mean I have to stop knitting?
My wife and I dive and we both enjoy it equally. Rest assured there are many women divers out there. What we have found sad is that there is not a large number of couples who dive. A significant number of people we meet, both men and women divers, tell us that their spouse/SO does not dive, only dives warm water or will go diving just once in a while.