Muscone

"Muscone is an organic compound that is the primary contributor to the odor of musk.

The chemical structure of muscone was first elucidated by Lavoslav Ružička. It consists of a 15-membered ring ketone with one methyl substituent in the 3-position. It is an oily liquid that is found naturally as the (−)-enantiomer, but synthetic material is typically a racemate. It is very slightly soluble in water and miscible with alcohol."

"Muscone has a peculiarly sensuous and erotic smell. As a large molecule, it is relatively involatile and lingers on the skin as part of the "bottom note" of a perfume, and also acts as a "fixative" which reduces the evaporation rate of lighter molecules in particular. For hundreds of years, man has been hunting musk deer in order to kill it and to cut out the musk gland, not just to obtain musk for perfumes, but also because some believe that it is an aphrodisiac. Killing one deer will yield only about 25 grams of dried musk pods"