Yes, communication is certainly an element, but I feel our chemistry is rather more nuanced. Going through pregnancy, birth, child-rearing, menopause, empty nest, accumulating health issues, all that, has meant we had to adapt at each new point. Communication has wandered in and out, including some couple's counseling, but at bottom, it's maybe two things: we both remain interested in sex and hold a belief that we're in it for the long haul.