There is a pretty easy explanation, most gambling addicts are men because most gamblers are men. Just enter a big casino and you will see that most customers are men, or watch one of the big poker tournaments on TV and you see only men playing. Here and there are also some female gamblers, but I would expect that 90% of the Poker players are men. During my visits to Las Vegas I noticed the most woman where at the slot machines. Based on that I would expect most gambling addicts to be male. There are also some additional facts like men are more common to go gambling alone, whereas woman tend to stay in groups. Which also means that woman are looking for a good time and want to socialize, whereas men focus more on gambling itself.