Always adorned with a smile and trendy, clean-cut attire, Ken Gasch appears bashfully unassuming. His soft features combine matured cherub with all-American boy, and he giggles at everything. The 27-year-old dancer and HouseHold Arts Collective artistic director says he's "filled with nervous energy." Yet underneath a prep school-styled necktie and fitted slacks, Gasch's low-rise briefs are black. His underwear complements the metal-studded straps and harness openly cataloged in his wardrobe. He keeps his spit-shined combat boots next to his ballet slippers. Gasch can't be that unassuming.