When one thinks about it, it is nigh impossible to be completely matched up on ANYTHING. There will always be some degree of separation - libido, intellect, emotion, sense of humor, sense of adventure....the list goes on.
I suppose when any of these gaps become impassable, problems arise. If the gulf happens to be in an area that is not important to either person, no big deal....Maybe Mazlow comes into play here...if a person is fully satisfied on the sexual (physical) need level, then the gaps in items that are belonging, esteem or self-actualization take on a greater importance. MI would come somewhere between esteem and self-actualization.
On the other hand, I have noted that ML seems to be a magnifier of other gaps.
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You make a great point about Mazlow's needs hierarchy. I do wonder sometimes what new needs would crop up for me once my sexual needs are met since they have never been met for more than a few days at a time.
I might argue that it is a need for the species (at least for the next 4553 years).
"Yes, yes, the species, I know. However, I was under the impression that Maslow applies to the individual. "
I think it's the "zero'th" level on Mazlow's pyramid....much like the zeo'th law of robotics (reference left to the Asimov geeks among you,if there are any)
I don't think the need for sex is on the same order of magnitude as basic survival--at least for me. However, once survival seems assured (and I can only think of 5 or 6 times in my whole life when it was in question), the first motivating need for me is the personal acceptance and validation of sex.