Out-of-step sex drives
Sex and relationships expert Dr Victoria Lukats has some advice for a wife whose husband is asking for anal sex but her sex drive is out of step with his.
"Why does having a lower sex drive than your husband make you frigid?" she writes in Metro. "It's not really your problem alone - it's an issue that affects you both as a couple..."
Talk over your issues helps enormously, and a better sex book can be a great ice-breaker.