You're being overzealous narrowing the search space because you're assuming independence between these traits. In particular, you first assume we are only consi

You're being overzealous narrowing the search space because you're assuming independence between these traits. In particular, you first assume we are only considering those between the ages of 20 and 30 in sf. But among young people this age in sf, I assume >%50 are physically fit (if by that you mean not fat/"normal"), >50% are college educated and have a job; also, in my experience, the percentage of people in a relationship varies hugely between the ages of 20 and 30 (from <20% to >75%). And of course, since SF is the center of an urban area, many people commute into SF to both work and have fun / go to bars. And here's a quick sanity check: spend a day walking around a large tech company like FB or Google. You'll easily see over 330 people at each company that meet all your criteria (except perhaps living in SF proper).