A woman’s contribution is to always look as if she ready to bear a child (fecund and youthful)—yet never actually become pregnant. Howzzat?
You can strive towards achieving that goal if you want. I would not consider it necessary.
My wife makes porn unnecessary. After three kids and close to thirty years of being together, she's generally in the mood for sex at least four times a week, sometimes more.
My philosophy is, a woman who makes an effort to keep her husband sexually satisfied has the right to complain if he becomes heavily into porn.
A wife who is not in the mood to keep her husband happy, who is not interested in sex more than once a week, should not act surprised if her husband watches porn as an alternative outlet.
A wife who is in the mood less than once a month, should not act surprised when her husband leaves her. Actually, my experience with my married friends is that when a wife has lost interest, it's likely that she hasn't lost interest in sex, just sex with him, and she likely will be filing divorce papers soon.