The answer is simple and straight forward. It is all about receptors,scattered on the surface of any cell in the body.(An adult has 100 Trillion cells).The specific scent that reach a specific receptor, stimulates a specific substance AKA Cytokine. This substance-messanger,travels via the Ion Channels targeting a specific cell, When stimulated, the specific cell starts its designated job. In the case of ovarian cell, it stats ovulation-Getting ready to conceive,