It wasn’t the sex ratio, it was that so many men in SF are gay the pool of available normal men is much smaller. SF is one of those cities where the BS claim of 10% of the population being gay is likely an understatement.
I will grant the gay thing, but there was still, beyond that, a really skewed sex ratio. The majority of the bridge&tunnel crowd was women. All those downtown offices ran on women. Out of towners looking for entertainment? Women.
“Tales of the City”, Armistead Maupin, was entirely accurate, very well observed. That was the scene (not the gay-obsessed later books) there was. Mary Anne, the character, was an entirely accurate psychological portrait of the typical girl in SF at the time. I ran into “Mona” too, God help me.