it was not a case of consentual sex.. the, um, swan, might have been a god, but he was also a dog.. and it was rape.
the osamania question?

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it was rape There seem to be variations of the legend -- or of its interpretation. Contrast:

http://www.artfromgreece.com/stories/v29.html: Zeus, master of disguise when it came to seducing women, changed himself into a magnificent swan, which Leda quickly fell in love with.
http://www.wesleyan.edu/col/comps/leda3.htm: W.B.YEATS "Leda and the Swan": based on mythical story of Zeus taking the form of a swan, raping Leda
(the Yeats poem itself appears at http://www.princeton.edu/~rhwebb/leda.html)