The number of men interested in sport is far more than the number of women consequently those men who have knowledge in some of those sports utilized that opportunity in gambling particularly soccer betting which I believe is the most popular and most sought after in gambling, Moreso some men gamble to earn money as an extra source of income to cater for their home basically a lot of women particularly housewives aren't interested in sport particularly gambling because house chores and other domestic jobs wouldn't allow them to have time to gamble, Infact in my suburb I have never come across a female gambler it is dominated by guys who share tips.
I feel like it's more about the fact that genetically speaking we are a bit more adrenalin addicted, that's just how it is and it's always been true. Yes we are in the modern world and everything should be equal, but when it comes to seeking adrenalin due to our heritage, men are a bit more overwhelmed.
All the soldiers, wars, you can go as further back as saying that we hunted animals and brought them back. So, as you can see we seek that adrenalin and that means that it eventually ends up with us gambling more. That is fully correlated and I believe that it will end up with any study will show that the same thing would be the result. This is why it's quite important to make the distinction why men gamble more.