Gambling is surely made not only for men, but it is basically more suitable for men than women. That's why we call it as a 'men stuff'. Even there are more women to join gambling, they are unlikely to dominate it. Most women prefer to avoid too risky stuff, only men who like the risky stuff. And only a few women think gambling is a fun stuff, most of them probably feel not happy since they hate to lose money.
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
Women aren't always known to be risk-takers, and might not have that much risk appetite, but that doesn't mean that they won't be able to gamble just like what men do. Some activities that used to be men-only, women are already doing, and that involves gambling. It might be 'suitable' for men due to their risk appetite, but calling it a 'guy thing' is like stereotyping. I might be reaching with my statements in here but in this day and age wherein we are given too much freedom, activities wherein men dominates, the women can also excel at.