Eight couples receive expert advice, sex therapy and date other people to decide whether their partner is 'the one'. David and Beth receive some helpful sex therapy, Elle continues to struggle with cheating boyfriend Andy sharing a room with another girl, and Stephen's secret is exposed.

Holly and Karl learn something in sex therapy, Stephen upsets Abbi with yet another confession, Jess is brought to tears as the girls rate the boys from best to worst, while Elle is reduced to tears by Andy yet again.