No.
It’s because they are exhausted running after the kids.
When my children were young, my husband and I had a dry spell. Too tired, always running, 100 things to do.
Now that the kids are older, we’re like newlyweds again.
I do agree with you that husbands should do more in general. Men, generally, have more energy than women.
Also, in Biblical tradition, the husband basically gives up all rights to his life and gives it to the wife.
You know, busy husband makes for a happy wife.
Also, animals sexually imprint. We are no different, even if we have more choice in the matter. Whom we have had sex with the first time or whom we have had sex with frequently is going to have an effect on whom we would to have sex with.