It's a bit difficult to take the "shower of gold" claim seriously as an original story since other children of Zeus were born through intercourse. Ancient Greek and Roman mythology has been changed in modern "retellings" to support the idea that virgin births and physical resurrections are present in religions other than Christianity. So. . .unless someone can show the original story had the "shower of gold" in it, and that the other stories of his intercourse to conceive children were false, I just don't buy it.
When I googled images of Danae, all the ancient Greek vase paintings I found were of a shower of gold pouring onto her belly. This representation allows for a definite identification of the characters.
You might have other vase paintings of a man and a woman, or Zeus and a woman, and not be able to identify Danae, unless the bronze chamber was indicated. On the other hand the vase itself can symbolize a chamber with a hole in the ceiling.
I still say it was totally out of character for Zeus to enjoy a woman in such a fashion. Swan, sure, bull, yeah; that’s the kind of god he was, but not a formless emission.
Well, they're all 'stories'. I don't see any evidence that the shower of gold story was made up after 1 AD, but with myths, anything is possible.