The writer-director Alan Rudolph creates an impish roundelay about two married couples, one middle-aged, one younger, who have affairs with each other’s partners. Nick Nolte stars as Lucky Mann, a sexually voracious handyman, but the cliche is both a joke and a fake-out. Julie Christie, as a former B-movie star who has been married to Lucky for 24 years, does another variation on the depressive Rudolph heroine. Christie, though, is anything but depressive; she drops her zingers with world-weary aplomb. Afterglow marks the first time since Choose Me, in 1984, that Rudolph’s voluptuously indulgent style — swoony yet acrid, in love with love itself — has coalesced.