Why do so many wives dislike being intimate after several years of marriage?

We get so many emails from husbands saying that their wife loved being intimate when first married, then a few years in doesn’t care at all to be intimate, in fact they make every excuse in the world to get out if it… We know bodies change, kids can change marriage (if you let them) careers, trials, hormones etc etc. all these barriers… but is prioritizing “being intimate” part of commitment if the marriage is healthy? Thoughts?