If you have an idea why your sex drive has decreased then you can pose a question with that info and we might be able to help you better. Got any ideas?
You could be tired and need more rest.
Your husband might not be approaching you like he used to.
You might not be dressing up to get him excited becuase you are too busy with the kids
You might be feeling cautious because you don't want the kids to hear and that causes you to not relax and let it happen.
Maybe you need to find some new spark with hubby...do you have date nights?
Maybe He is afraid it is his fault and is afraid he cant succeed at turning you on...in that case i would suggest counselling.
I am confident that as long as you and hubby are able to comminicate openly you will be able to solve this. Hope this helps a bit, and if you know why your drive has gone down, let us know so maybe that will help us help you.