Beautiful girl falls for older guy - really? Mostly in (male) fiction

Is there or is there not a certain genre of stories and novels (and films?) invariably by (older) men invariably about how a beautiful young woman is completely smitten with them - intellectually, physically, romantically, sexually - might this in fact be a bit of a male fantasy going on here? How often does it happen in life (not that often), how often in literature (a lot). How often in films (all the time!). And are these stories often by British writers? They are! Such as Ian MacEwan's well written but purely fantastical story in current New Yorker, A Hand on the Shoulder. Ostensibly, story is about a Cambridge student, female, beautiful, recruited for the MI5 or whatever it's called, by a dapper, older don who begins by taking an interest in her intellect but of course pursues her amorously and more or less ditches his inconvenient wife (who conveniently remains stashed away in London) - the girl, Serena?, is crazy about him but at the end he dumps her - making up a really lame excuse for his loss of interest - and she's heartbroken but does in fact get the call from the MI5 and goes on to a long career - she's narrating this as a 60ish woman, looking back on 1972 - as a spy. I could see this perhaps as an early chapter in a novel, in which MacEwan takes on Le Carre, in a more literary pass at the spy genre - he's shown that he can take on all sorts of British literary genre cliches - as his great novel Atonement managed to treat the hoariest of British literary tropes: the country house, the war memoir, upstairs downstairs - and find something fresh and new. As a piece of short fiction - I don't know - it did hold my attention, and MacEwan's style is exxceptionally clean and direct here, but really, I admire MacEwan for telling this story of a young woman throwing herself on, or throwing herself away on, a much older guy but he brings very little perspective to her: why would she be so interested in him unless she were extremely weak and needy (she's not) or an opportunist - which maybe she is, but MacEwan doesn't develop that element of her character at all. Hey, she should dump him - not v.v.