Women's sex drive declines after dating someone for a long time, but why? Not a day goes by without a piece of research telling us that our dating and relationship lives are all down to basic biology. The latest, hailing from Canada, has found that women's sex drive declines significantly throughout long term relationships / serious dating , while men's stays the same throughout. This, say researchers, is down to men being program-med to continue producing offsprings and women being program-med to lay off the sex and concentrate on bringing up the young. But are things really that simple? Reading the comments in the Daily Mail article talking about the research paints a somewhat more complex picture. Women have weighed in citing various reasons for no longer being attracted to their long term partners in a sexual way. Some say their men have let themselves go and are no longer the attractive hunks they married. Others claim the sex life itself has gotten boring, no longer providing any excitement. Interestingly, one woman commented that for her (and other women), sex is as much about mental stimulation than it is about physical stimulation, whereas for men the physicality is often enough. Keeping your sex life interesting over a period of many years is challenging. The fact is, many women regain their sex drive by moving on or even cheating on their men, in much the same way men would. Is this a sign of a primitive urge to produce more young