AVANT HARD trots out one lewd groove after another, with a single-mindedness that makes these cybersexual pursuits entertaining rather than perverse. Add N To X cruises for wares on the streets of "Robot New York" and fantasizes about tantric positions even the Kama Sutra must have overlooked on the aggressive "Buckminster Fuller." The down n' dirty percolations of "Fyuz" suggest that Barry Smith, Ann Shenton, and Steven Claydon all have volumes of POPULAR MECHANICS stashed under their mattresses. What a curious crew.