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responding to your post on p. 8:
Like you, I don't think women trade sex for household chores. It certainly doesn't work hat way in my house.
BUT, when my husband does something out of his way to make my life easier, which can include doing household chores that he does not typically do, I feel valued, loved, cared for. (I generally feel that way anyway, but I get an extra "surge" of that feeling, whatever). My husband, in that moment, becomes even more attractive to me.
Were I to remove my husband's shoes when he came home from work, I doubt he'd feel the same way. BUT, there are lots of other things I can and do do, to express my affection and appreciation for him.
When we are feeling well-loved, we may tend to have more, or at least even better than usual, sex. It's not "payment" for anything, but it's celebrating and sharing how good we feel about ourselves and each other.