Submarine

15-year-old Oliver Tate has two objectives: to lose his virginity before his next birthday, and to extinguish the flame between his mother and an ex-lover who has resurfaced in her life.

Submarine is a 2011 drama romance movie directed by Richard Ayoade, starring Craig Roberts, Noah Taylor, Sally Hawkins. It holds an IMDb rating of 7.3/10 from 101,142 votes and runs 1h 37m.