After Allan strikes out with Sharon, Linda tries again, recommending Jennifer but warning him that she's a nymphomaniac. He is undeterred.
He approaches a cab, waiting while it disgorges a group of grass-smoking hippies ...
Then ... but quickly regrets getting in, having to immediately leap out to escape the acrid fumes.
... and Now, this was filmed on Buchanan Street in Pacific Heights looking south towards Jackson (map). The bricked building at left is 2518 Buchanan.
He finally meets Jennifer and after spending all evening hearing that all she's interested in is sex, sex and more sex, he makes his move, only to be rebuffed with a shriek.
Then ... He descends the outside steps totally confused, wondering how he could have misread her.
... and Now, this house is at 2065 Vallejo Street, in Cow Hollow (map), just a couple of blocks from the cab episode location above. Clearly the occupants here have no need of a fitness club membership.