SAN FRANCISCO (CBS13) – I know it when I see it. Defining obscenity may have stumped Supreme Court justices, but in San Francisco’s Sunset District, Larry Flynt’s Hustler Club Truck must put the petal to the metal and go.

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Girls are inside most Friday and Saturday nights. It’s a mobile enticement for the legions of tourists who share the “XY” chromosome.

But even the tourist libido retires for the night, as so does the truck’s driver. For over a month he’s been putting on the brakes at 37th Avenue and Balboa. And neighbors are outraged.

City Supervisor Eric Mar says complaints flew fast and furious.

“[The truck is] right by the Anza Branch Library and half a block from an elementary school,” said Mar.

So he had the titillating truck towed for expired tags.

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“If you look inside there’s a pole so some women can dance around it, as this thing drives around the street,” said Mar.

The truck took a hiatus, but much like libido it came back, this time to 42nd and Geary.

It’s a game of cat and mouse, and calls to Hustler Club management go nowhere.

Hustler didn’t return phone calls, perhaps because they know there is a 20-year-old city law that forbids vehicles commercially advertising on public streets.

Even if they don’t, Mar’s working on a new law that tows any and all titillations.

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“We don’t want this truck in our neighborhood,” said Mar.