Also, while there, I have seen no young women who seemed to be PhD candidates.

Perhaps true. However, how many of the same-aged guys are PhD candidates?

5. Given what Hooters pays waitresses (diddly-squat, like most restaurants, making tips the waitress's main source of income), would not a young woman as well-endowed intellectually as she would have to be physically be able to do better at some other job where she can use her intellectual qualifications?

I've gotta part with ya here, Byb. When I was in school, I knew plenty of intellectually-endowed women taking jobs that paid low but had great flexibility, evening shifts, and other amenities that made college life (for their PhDs perhaps) bearable. Walk around NYU, UCLA, Texas A&M, or other good school, and catch up with those whose parent's aren't paying their way. You'll meet many 3.5 gpa and above waitresses, exotic dancers, newspaper deliverers, and other (what some USns think as)sub-professionals.

Edit: A good example is me. I worked a non-intellectually-stimulating graveyard shift with drug addicts to pay my way through school (with highest honors).