[QUOTE=FredMoore;2302958]Sex gets boring with the same partner after a while, therefore the partners get less caring about pleasing the other and the relationship spirals downhill. I do think women enjoy sex in the right circumstance -primarily when they are looking for support. Why is it that divorcees get separated, go to the gym, diet, and regain their attractive appearance and attitude? I am seeing my first MILF divorcee soon. We shall see. Call me cynical but the mental and physical quality is much improved in the 20's over the 40's.
Menopause? There is nothing good that happens sexually after that time of life except they can't get pregnant and therefore might be less inhibited.
By the way, men stop trying as well. We can get fat, slovenly, and stop trying to impress our mates, therefore turning them off. A new guy will have his best face on and will be better, at least for while.[/QUOTE]I've noticed that for both males and females, unexplainable weight gain seems to be almost the first symptom of being recently hitched. When I was married, there were times I definitely started slacking off at the gym, and felt that common feeling of entitlement or feeling licensed to let myself go. I don't know why we do it though. After that marriage, I told myself that no matter what I will never succumb to complacency again and allow myself and be one of "those people" who think that marriage (or a live-in relationship) is the end game and where taking care of ourselves stops. Getting too comfortable with our partner is often a death-wish in a relationship. Maybe one of the reasons things are still working with my GF is because I've applied lessons learned in the past. Within reason, I try to always behave the same way I would if it were someone I'd only known a couple of weeks. A good rule of thumb is that if it's a behavior you wouldn't reveal a professional colleague, think twice before getting too comfortable and revealing it to your partner, and never grow complacent for better longevity.
None of this really helps keep sex exciting though. As you said, that's going to decline just because of sheer lack of variety one way or another. One of the best things about the bowl, online dating in general, or even bar hopping is the sheer excitement of fucking someone who is almost a total stranger. I think that's one of the reasons these SBs do it -- sex without the strings of caring too much who the other person really is has an excitement to it that is impossible to match in any regular relationship, even with the boy of their dreams that is their own age.