I concur with what J-Man just said. Another bar that sometimes has go-go's is Beaux bar (beauxsf.com). If you click on events,
This is what it says for fridays and saturdays:
Manimal Fridays
Enjoy life on the wild side with the hottest Manimal GoGo beasts!
$2 wells from 8:30-10pm // $7 AMFs all night long
No Cover before 10pm
Nitty Gritty Saturdays
Get down to the nitty gritty with a revolving cast of DJs, drag hosts, & GoGo studs!
$2 wells from 8:30-10pm // $7 Long Islands all night long
No cover before 10pm
On thursdays it functions as a piano bar. I happen to know who the pianist is: a fabulous jazz musician, lady of color, former chairman of the music dept at SF State, and current head of the Theatre dept.