It is so hard balancing your children, cooking, cleaning, working, and on top of that having sex with your husband. Where do we have time to feel all sexy and get in the mood? We don't! All I can say is that I share in your exhaustion. I have three kids and me and my ex husband really struggled to have a sex life. What worked for us was we would get a babysitter or ask our parents to take the kids for at least two nights a week (this is why god invented sleepovers, for husbands and wives to have sex!) and we would make sure to have sex during that time. I know how romantic, scheduling time to do it, but this was our only option and it actually worked. I would say to ignore all the statistics of how many times a week married people have sex because it is so individual. Me and my husband would do it twice a week at least. I have girlfriends who did it once and some even less. It is really about how you and your husband feel and if you are satisfied with your sex life.