Men are willing to die for sex.

Study published in No Duh Monthly. From Live Science:

Men evolved willing to risk death for sex, partly explaining why men die faster than women in virtually every country worldwide.

But monogamy and economic equality could counteract this trend — by assuring men they are likely to get some loving, a new study suggests.

The study was published in the current issue of the journal Evolutionary Psychology.

"The name of the game in evolution is to get your genes in the next generation," said study researcher Daniel Kruger of the University of Michigan.

Reproductively speaking, men have more to gain, and less to lose, from risk-taking behavior than women, researchers have long said. Essentially, it's okay if the guy dies, because at least once he's done the initial deed, there a chance his offspring will survive.