Richard Cull

Matty struggles to be separated from Jess, Beth brings David to tears, Nikita thinks it's all over, and Elle and Andy also hit rock bottom.

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.

David has one-on-one sex therapy, Nikita shares Stephen's dirty secret, Elle realises that it's not only cheating Andy who has to change.

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.

The latest challenge causes shockwaves as the new couples get physical. After fleeing sex therapy in tears, Karl's moves with Abbi send Holly over the edge, and Elle and Andy make the ultimate decision.

Things get personal in paradise. Matty tells Andy exactly what he thinks of him, and Karl makes a potentially catastrophic relationship blunder.