I’ll bet the men who help out with housework are married to women who work full time and are parents as well.
You're most likely correct. My wife is a housewife and she does most of the "female" work. I do the food shopping, but only because I pass by several supermarkets on my way home from work, so I might as well.
Anyone that had read the book “No More Mr. Nice Guy” by Robert Glover would not have been surprised by these findings.
Women are sexually attracted to masculinity. In particular, women are attracted to men that step up to a traditional male leadership role (not dictatorship role, btw).
Guys get married and concentrate on having an “equal/fair” marriage, that they are afraid to provide any leadership in the marriage (because, that would be unfair).
My guess is the guys that concentrate on doing more housework are also the guys that concentrate on having a fair/equitable marriage, making them tentative about exerting leadership. Making them seem less masculine in their wife’s eyes, making them less sexually attractive to their wife.
Confidence, assertiveness, decisiveness are all masculine traits women are attracted to.
Being tentative to make a decision, because it might displease your wife and looking to your wife to provide leadership/make-decisions are not masculine. The are definitely not traits women find sexy in a man.
My guess is the guys that do more housework tend to display more of the second set of traits.
In other words, now both of them have a headache.