Otis Milburn
Played by Asa Butterfield

Jean’s teenage son is a little shy and awkward, and definitely isn’t in with the cool kids at school – that is until he realises that his accidental expertise in sex could prove lucrative and make him popular.

Jean Milburn
Played by Gillian Anderson

Otis’s sex therapist mother is mischievous, promiscuous and laid back in many ways – but isn’t quite as hands off about parenting as she first appears. As with her patients, she wants to talk to her son about his sex life, but he is reluctant to share things with her.

Maeve Wiley
Played by Emma Mackey

A bad-girl at school with a troublesome home life and money worries, Maeve realises how lucrative Otis’s sex expertise could be, and persuades him to set up the clinic with her.

Mr. Groff
Played by Alistair Petrie

He is the headmaster of Moordale High and the incredibly strict father of Adam.

Aimee Gibbs
Played by Aimee Lou Wood

‘It’ girl Amy is determined to cling onto her status even if it means rejecting Adam, who despite being a doofus does mean well.

Eric Effoing
Played by Ncuti Gatwa

Otis’s irrepressible gay best friend Eric is always at his side, and is keen to get the pair of them in with the most popular kids in school.