Betty buys the "ABC Of Sex" book in order to teach her son Bono the "birds and the bees". Agnes, meanwhile, with the help of a gigalo site called 'Dial A Dick', gets a sex date for Valentine's. Dermot employs Buster to buy a bus saying 'I love Maria Brown' after hearing that she thinks he is not romantic anymore. Buster screws up by also writing 'Cathy Brown does not need her tits blown up'. Granddad, with the help of viagra, gets a threesome.