NBC’s Will & Grace is still a big hit, but what if you reversed the sexes? Then you’d have ABC’s newest sitcom project, about a lesbian who lives with her best friend, a straight man. Aptly enough, the show will star Melissa Etheridge. The openly gay rocker will play a music teacher rooming with the guy and — here’s the other twist — a teenage girl. They’ll raise her as their own kid, even though they’re not a couple and the girl is actually the daughter of another friend. No word on when the show might debut, but ABC is surely already planning a sweeps-month guest spot for David Crosby as the real dad.