I've had this same problem and I'm convinced that it's stress. I've been sick alot in the last few months, my two nephews live with us, my step-son is with us more, DH is out on disability, I had to quit my job because of migraines and
money is not just tight but almost non-existant. All of that really doesn't put a girl in the mood.
What works for me is taking time alone with DH. I pull him aside and tell him that we need us time. Not us and kids time, just us time. It's so difficult to feel sexy with a bunch of pre-teen and teenage boys lurking in the
house but I have to tell DH to find us time to be alone.
We don't have money for vacations right now but one thing that does work for me is taking the boys to my parents house for a couple nights and us having the house to ourselves. It's like a really cheap mini-vacation.
We also try to have date nights or date days. Even if it's just a couple of hours to reconnect. We do things where we can walk together and hold hands and act like we are dating again. That always seems to re-spark the
spark.