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.

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.

“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.

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