…famously asked Sigmund Freud. A couple of neuroscience researchers have attempted to answer that question, at least as far as the preferred profession of a romantic hero goes. Researchers Ogi Ogas and Sai Gaddam analyzed 15,000 Harlequin romance novels (fifteen thousand???) and tabulated the professions of the male leads.
I don’t know to what degree Harlequin readers are representative of romance-novel readers as a whole, nor to what degree romance-novel readers are representative of the female population as a whole…but for what it’s worth, here’s the list that resulted from the study.