At Kenny Schachter Contemporary on Charles Lane in Greenwich Village is a new video installation by Susan Smith-Pinelo, the Washington, D.C.-based artist who has something of a reputation for a videotape in which a girl, in close-up, jiggles her breasts in time to a Michael Jackson song. Here, she's installed two tape loops of a woman's gyrating lower half, clad in Daisy Dukes, titled Asstronomical Porportions I and II. In the gloomier back of the space is a video projection of the torsos of several young men, their jeans riding well below the tops of their undershorts. Upstairs are some color photos of the same. The videos, in an edition of three, are $6,000 to $10,000, depending on the number in the edition; the photos are $3,000 each.