Intellectual Stimulation. The brain is the most significant sex gland in the body.
I never could understand the appeal of the stereotypical "Dumb Blonde" - what can you talk about with someone whose only attractive assets are physical? What happens when the physical appeal wears off, and there is only the emotional attachment to keep you together?
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.