When you think about it, things haven't really changed all that much since medieval times. Women still very much appreciate a bit of bravery - a man with courage is hot. Though these days it's not so much about winning duels on horseback as it is about daring to succeed in more modern-day scenarios. If you're someone who can take a leap of faith and land on your feet, it's going to be very attractive to potential female partners.
What are these modern-day challenges we speak of? It could be as simple as learning to surf or traveling to somewhere exciting. Maybe you're taking a risk and starting your own business. Or perhaps you're finally taking the final step towards property ownership. All of these require some level of courage, and women can't get enough of it.