"Another thing is the sexual aspect of it. One has to remember that in the Muslim world, casual sex, Western-style, doesn’t exist. If a young man wants sex, there are only two possibilities – marriage and the brothel. You have these vast numbers of young men growing up without the money, either for the brothel or the brideprice, with raging sexual desire. On the one hand, it can lead to the suicide bomber, who is attracted by the virgins of paradise – the only ones available to him. On the other hand, sheer frustration." (thanks Ahmet)