Slimmed Christina Aguilera loves her ultra-thin figure, but sources said instead of firing up her love life, the “Dirrty” singer’s lost interest in canoodling, leaving fiancé Matthew Rutler tearing his hair out in frustration. An insider said the 43-year-old songbird is all about looking as sexy as she can these days. The source said: “She’s constantly showing off her body and parading around in skintight clothes, so people probably assume she’s got a hot sex life to go with her hot body.” But it’s actually the total opposite. Apparently, she and Rutler used to have a way better sex life. Adde…
