Rather, anything that threatens their own inclusive fitness.
Apart from that you may be in the right area. In the environment in which we evolved, a successful male can theoretically have more children by having more partners, whereas a female cannot increase her progeny in this way. It also seems that an unsuccessful male is less likely to have any children than an unsuccessful female.
In short, variance in reproductive success is supposed to be higher in males, and its theorised that there's been a selection pressure towards more risk-taking in males. Naturally, this sort of thinking has its detractors.
Looks very interesting but I'm without headphones on my computer in a cafe in Taipei. If you have the briefest of moments, would you care to give a short rundown of some of the more interesting points to you?