Don't have any such citations, but I want to chime in on the "welcome to your 30's" thing.
Since around my 30th birthday, I go through phases of low interest, lack of real physical response, etc. Probably last a couple-three days. I've been thoroughly checked out by a doc, it's entirely normal. During those times, it's a useful thing that I'm good with my hands, if you follow me. I enjoy satisfying my girl(s) and I don't particularly need anything back from them. And then there are phases where I'm a complete animal. Normal. Happens. Not a problem unless you make it one.
Here's the One Truth about sex: When you're hot you're hot, and when you're not you're not. All the rest is just noise.
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