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Or it could be evolutionary and have nothing all to do with Hollywood. Throughout history, a man's ability to take care of a woman has been a stronger indicator of compatibility than a man's looks. Men who wield power depend largely on their abilities to get there. The looks of powerful men vary widely, just like the paths to power vary widely.

For most of history, however, women did not wield the necessary sorts of power. Thus, for them to get ahead, they had to make themselves desired by those with power (aka. males). Additionally, they had to be less picky about a male's looks.

Hollywood merely takes advantage of the ingrained societal norms already in place. Its "Sexy Prototype", as you put it, is merely a representation of societal desires.