Having discovered a freckle on his bum, Steve worries of its health implications. Meanwhile, Jane introduces the group to her abstinent boyfriend, James, and Jeff has trouble with a key and Julia's ex.

Steve is suffering from a bout of hypochondria, thanks to the discovery of a mole on his bottom. This leads to a bitter argument with Susan about how well the pair can remember each other's blemishes. Steve feels hurt that Susan can't remember if the mole is new, and Susan becomes paranoid about the possibility that she too may suffer from freckles in her otherwise-perfect private regions.

The argument is settled when the gang are introduced to Jane's new boyfriend, James. It turns out that Jane has perfect recall of Steve's mole. And it also turns out that James has perfect recall of Susan's "nether freckling" - the two of them were briefly an item at university.

Meanwhile, a kinky evening with Julia goes horribly wrong when Jeff swallows the key to the handcuffs. Things go from bad to worse when Julia's ex, Joe (a man prone to violence), turns up at her flat demanding to see her. Jeff narrowly avoids being beaten to a pulp, but his heart is in even greater danger of being broken than his bones. It seems that there's a lot of unfinished business between Julia and Joe.