Men are hunters by nautre, and are visually stimulated as has been proven by numerous science and psychological experiments throughout the years. It doesn't matter where men and women gather, men will eventually begin to hunt. A purposeful play on words here.
Lets also be realistic. Though there are women who actually approach men, they are far and few between. The fact is that for a man to eventually date, or meet a women he has but no choice to start approaching women.
What's that?! You don't believe me?! Well then, try a very simple experiment. Go to any bar or nightclub in your area where men and women mingle to meet and take a true observation of how many men vs women approach the opposite sex to strike up a conversation. For the many here too young to do so, you'll just have to wait. I would venture to guess that a single evening should suffice, but for some semblance of a true experiment it should be done on popular days and times, and over a small period of time, say 3-4 different weeks.
Smells like jealousy in here.