In this solo show, writer-performer David Chapman demonstrates self-deprecating wit and a keen sense of audience expectations, which he pointedly mocks or manipulates. Detailing a young man's adventures as a "Kinsey refugee," this autobiographical comedy has a structure dictated by the solar system, which inspires Chapman's anecdotes and analysis of his sexual confusion. Though he's winningly open about adolescent awkwardness and misguided dating strategies, over the show's 70 minutes he proves himself a better writer than performer: he's not versatile enough to differentiate the other characters he briefly portrays. Under Michael Fosberg's direction, this is an entertaining examination of the parameters of sexual identity. But the piece falters once Chapman moves beyond Mars to an asteroid belt that elicits various derisive inner voices, and by the time he reaches the outer planets, the energy flags and the show's tone becomes more uneven. Through 6/19: Thu 8 PM, Fri 9:15 PM, Sat 6 PM, Sun 5 PM. Bailiwick Repertory, Bailiwick Arts Center, 1229 W. Belmont, 773-883-1090. $15.