I'd say it has to do with taking on more responsibility as you age. The more that's on your plate, the less time you have sitting around being bored. You might see some anecdotal evidence of this in that couples have more sex if they are locked indoors during a storm, etc. ...or so I've heard.
It may also have to do with (correct me if I'm wrong) the level of endorphins increases when you first find "love" and then decreases over time to a more mellow state. Naturally your sexual desire wouldn't be as strong, but that doesn't mean attraction is diminished.
In my case, we didn't even have sex until we were married. Oh I would have, but she was the strong one haha.
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We contend that for a nation to try to tax itself into prosperity is like a man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill
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