Why the Irish have taken to swinging

MONOGAMY can be tough, as can infidelity.

To prevent their relationships from foundering, some couples permit each other to have sex with others, subject to rules, such as telling each other and every encounter.

Negotiated fidelity is the subject of The Velvet Pouch, the third book in an erotic trilogy by Australian author, Holly Hill, whose Sugarbabe and Toyboy memoirs enraged prudes and monogamists.