If “not tonight, honey” is an all too familiar refrain in the bedroom, lack of sex drive may be to blame. Many things — from your diet to your medication to your mindset — can put a halt to the bedroom heat. The good news is that most causes of low sex drive can be treated. By giving your sex life a little TLC, you can jumpstart your libido in no time. Here are 13 things that might be putting out your fire — and what you can do to reignite it.