Dom's keeps making fun of his mum Sue - after what she did when meeting Art Green for the first time. So Meg got her on the phone to reveal some embarrassing stories from Dom's past.
One of them involved what he did in Grandad's spa pool:
Dad caught Dom putting his penis on the jets... I don't know. Grubby little boy.
So that must be why he owns a spa now. But Dom went on to explain even further:
My peen was little back then so it could fit all the way in...
That's right. Dom had sex with a spa pool.