Just, that is so interesting; my son did the same as yours. He fell in love with Fay Wray, the actress from the original King Kong. We had a board game in which there was a card representing her, and he used to get the card out and stare at it.
He also loved the actress who played Wonder Woman, Linda Carter. We bought him a poster of her for his birthday, and he'd spend hours leaning next to the poster and sometimes having a Wonder Woman kind of chat. (We made sure that he knew that she was an actor, and that WW was a made-up show.) The dissimilarities between his two Ladies was a little baffling, but then he's a Gemini....