Husbands do what they and their wives decide is fair and appropriate according to what works for them as a couple. There are no set rules. The more a husband helps the more he is appreciated and respected. This of course fills the wife with more love that she continues to shower on her husband. It keeps the cycle running. Especially if the wife is working and the husband’s hours allow him to be home at more convenient times.
If anyone thinks that any job is beneath them, they should remember who their partner is and how much they are supposed to love and respect them. So each are required to do for the other and there are no jobs that are beneath one or the other. What ever works best for the couple is what should be done, and no one should comment or butt into their arrangement.