its either your jobs as one fellow said or she is cheating. Either way you need to talk to her. Take a night off and plan a romantic evening for the two of you away..... away from the kids spend the money and go to a "love shack". In my area there are place such as the "Inn of the Dove" and "The Feathers nest" or the Ceasers Resorts Honeymoon villas in the Mountains. This way you can see how it is with no distractions. If she still doesn't want to get intimate then at least she has no where to go but to confront the problem.... just my 2 cents