Why the bias? should gambling be only for Men?
Since that was the situation on your local, you can't take that situation generally here because I believe, most people here don't have the same situation. Since that was the setup and beliefs on your local, you should be able to answer that on yourself.
We don't know if there's a thing that
"influences" gambling there, in general, that's why it ends up to the point that gambling should only be associated mostly with males there. Look internally why things turned that way on your location.
There might be a point that you do not see yet.