One of the great pleasures of MTV’s new Savage U is watching Dan Savage’s deep-thinking but epigrammatic wisdom land on a whole new generation of sex-havers. This wisdom-bestowing happens weekly on the Savage Lovecast, the podcast in which Savage answers callers’ sex, love, and relationship questions. Tonight at the Neptune, the Savage Lovecast happens live onstage, featuring musical-comedy guests Garfunkel and Oates. The whole thing’s a benefit for Washington United for Marriage. Miss at your peril. (Neptune Theatre, 1303 NE 45th St,, 8 pm, $22/$100 VIP including post-show reception with Savage and Garfunkel and Oates, all ages)