Hi. I, too, have researched the difference between function and desire. I think libido lies in hormones. Or chemicals that are released in the body when the idea of sex is imminent. I am no doctor. But I do some reading and use myself as a testing mat. Lotta brain work this sex thing. Also focuses on ones standard of beauty. On one's dominance of the sexual partner. Etc... etc... etc. Yeah there are pharmaceuticals you can take. And natural supplements also. But you have to be able to know, yourself, what turns you on. I do feel in a slump sometimes when it comes to sex. But after ten days or so, if one still feels no sex drive. But has the apparatus to deal. Go see your psych doctor. No insult intended. My key is having several wives. Here in the African country I live in, that's legal. In America the other wound be your girl friend. Perhaps I have gone too far we this answer. Chew on that my friend. Talk another time.