SERIES PREMIERE: In this imported Brtitish sex comedy, Asa Butterfield plays Otis, a high-school student whose life at home and at school seems hellish: He’s picked on or ignored at school, and when he gets home, he has to deal with the uncomfortable conversations and advice generated by his mom, Jean, who’s a professional sex therapist and couples counselor. Most of the students here look about a decade too old, and the premise – in which Otis begins counseling his fellow high schoolers on delicate sexual matters, boosting his ego and reputation as well as theirs – takes forever to kick in. The two leading female roles and players, however, make it Sex Education both enjoyable and worth watching. Emma Mackey as Maeve, Otis’ eventual friend and co-conspirator, breezes through every scene she’s in – and Jean, the free-spirited, grey-haired sex therapist, is played by Gillian Anderson, who has such fun misbehaving in this role that her delight is infectious. Anderson, whose appearances last season on American Gods had her embodying everyone from Marilyn Monroe to David Bowie, keeps finding new ways to reinvent herself – and hitting home runs with every one. For a full review, see David Hinckley’s All Along the Watchtower.