Tonight: Your man breasts are called 'pecs'

• Powerhouse packs 'em in for pecs night, handing out cheap booze to guys who don't wear shirts. When: Starts at 10 p.m. Where: 1347 Folsom St., between 9th and 10th.
• The Endup's Fag Friday promises contemporary house music for young hipsters. Resident DJs Rolo, David Harness, Pete Avila and Neon Leon. When: 10 p.m. to 6 a.m. Where: 401 6th St., at Harrison.
• The Cafe's Boy Bar is all about high testosterone, low attitude and tight jock straps. When: 9 p.m. to 2 a.m. $3 cover. Where: 2369 Market St.