Victoria Beckham has revealed the secret behind her blissful married life - she sleeps naked and can't resist a nightly dose of sex when she and soccer hubby David hit the sack.When quizzed if she prefers sleep or sex in an interview with Allure, Posh replied, "Sex! I'm getting into bed with David Beckham every night, so, you know, there'd be something wrong if I said 'sleep'."The former Spice Girl also revealed she goes commando under the sheets, despite David's lingerie treats, reports The Sun.She said, "I tend to wear nothing, but David bought me these little sets from Agent Provocateur, his favourite store."