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I don't want to state the obvious here but it's because it has the highest density of gays besides prob Manhattan
Haven't seen a lot of evidence that SF has *that* many more LGBT folks than other major metro areas. Considering that those figures include bi people in m/f relationships & that women of any orientation can pretty easily have children, I wouldn't expect a super strong effect
Cali and NY are the two epicenters, much more than the South, Midwest, where the ppl migrate from
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US fertility rate is at a 30-year low
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