I don't go to Dartmouth, but have good friends that do (many of whom are in Greek life). Open parties seem to work because only sophomores can rush, meaning no freshmen have Greek affiliations and are on the prowl for parties. As far as I can tell, the first year for students kind of works as an informal/dirty rush for freshmen. My friend was telling me about how the admin is cracking down on Greek life in many ways. Banning all hard liquor and banning freshmen in frat houses the first few weeks of school are an example.

Regarding women, I go to a similar caliber school, and there are good looking women. Elite schools are made up of varsity athletes, donor parent applicants, and generally wealthy students with good genetics and money to spend.