Blow Buddies becomes Underwear Buddies tonight. In: jockstraps, briefs, chaps with no pants -- or wear nothing at all. Out: shirts of any kind, long shorts or pants, bare feet or flipflops. When: 9-11 p.m. Where: 933 Harrison, between Fifth and Sixth streets. How much: $12.
Powerhouse. For Macho night, guys wearing boots and blue jeans (exhibit A, left) get cheap drinks. When: 10 p.m. Where: 1347 Folsom St., between 9th and 10th.
Lone Star hosts Men in Gear. In: leather/latex pants, vests, shirts, uniforms, jackets, boots, gloves, harnesses, collars, cuffs, armbands, jocks, jeans, cigars. Out: cologne, deodorant, sweaters, khakis, suits, slacks, dress shirts, polo shirts, tennis shoes, loafers. When: 8 p.m.-midnight. Where: 135 Harrison St., between 9th and 11th.