Not Enough Sex, She Never Initiates

First time poster. My wife of 5 yrs and I disagree on nearly every topic and have a difficult time discussing anything rationally. She is very emotional person who thinks things are either the greatest ever, or the worst catastrophe and we therefore struggle to find a middle ground. I am 42, she is 35 we have a 13 & 15 yr old. To the point, I am not happy with the quantity or quality of sex in our relationship. We have been 6-8 weeks at times without sex, and often I would say we average 2-3 times per month even when we aren't fighting. I've attempted to discuss it with her many times over the last 5 years but nothing changes. We've been together for almost 8. She doesn't think there is a problem and always has an excuse (I mean "reason") why sex doesn't occur. I have discussed it, typed emails and texts about it, argued and screamed about it, gone weeks without saying anything about it, you name it I've tried it and nothing changes. Last Monday we were home together after several days of conversation about the lack of sex in our lives, it was a cold rainy day and a good day to stay in bed. We sat and watched a movie talked a little and still nothing on her part. When I finally got up agitated just before the kids came home from school, she asked what was wrong. I told her and she reacted by saying her plan was to have a nice dinner and "do it" after the kids went to bed. Needless to say, nothing happened and rarely does if I don't initiate. Am I crazy, or would it be normal for couples who are home alone all day to have sex during the day while kids are away?! Especially, since one of her "reasons" is that the kids are home, it's too late, one of us had to work late, etc etc etc. Now when we are home all day long her plan to resolve the sexual tension is to again wait until 1030 or 11pm at night? I've heard it all and now I've had it. There's always an excuse - if I talk about it, I'm putting pressure on her. I f I say nothing, nothing happens! It's a lose/lose scenario and I'm ready to call it quits. Don't get me wrong, we have many other problems but sex is a big one. I don't know what else to say or do to get her to see how important sex is in a marriage. Advice?

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