I think its really important to remember that a relationship in its entirity takes work.

The committment has to go both ways. The person (not always male) in the relationship with a higher libido, should commit to working on other areas, which are often doing more around the house, giving their partner naps etc.

Also as a relationship ages, sex often becomes a little old, so sometimes injecting something new and exciting is a great way to make it interesting again.
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I agree, I often say to my DH that sex is his thing while me (not an affection craving women), needs him to step up. He works alot and that includes travelling OS. So when he is home I need him to help. He has really stepped up since DD2 arrived and I do not really ask much of him as I am highly independant so I am very thankful and I know I need to keep my end of the bargain more. We just have to remind each other every now and then.