Leda: "loins" (9), "thighs" (2), "breast" (4), "nape" (3), "fingers" (5), "body" (7)
Swan: "wings" (1), "bill" (3), "dark webs" (3), "breast" (4), "feathered glory" (6), "heart" (8), "beak" (15)
Throughout the poem, Yeats chooses to describe not whole persons, but rather parts of Leda and the swan both. The selection of words used in each case (outlined above) can be viewed collectively and analyzed, and this is what I have endeavored to do.
Leda is aptly described in overtly sexual and violent terms, easily painting in her the image of the victim. However, this fragmentation and decomposition of Leda's body, though garnering some form of unease and perturbation, also acts as a dehumanizing force. Leda become less woman and more the aspects that construct her. It is as if she, as well as the swan, is being literally scrutinized under a microscope until all that is visible is the various parts that make a whole. This becomes most problematic when one realizes that this is not an extensive list; Yeats chooses very particular aspects to be analyzed by the reader.
Conversely, the descriptions of the swan, already dehumanized (or more literally "de-deized" from god to animal), serve a similar function that lends credence to the bestial rape imagery of the poem, except in one crucial line. In line 6-7, Leda is described as a "body" while swan-Zeus is given a "heart," a strangely human identifier in the midst of otherwise utter bestiality. While a heart in its physical form may be possessed by any living thing, including a god, a heart in its more abstract indefinite form is much less so, and certainly does not seem possible in this context of bestiality and brutishness. That Zeus is seen as having a heart while Leda possesses a mere body or vessel for Zeus' needs is both disturbing and telling. The imagery of the physical swan is also meant to be more beautiful and elegant than that of Leda, all curved white "great wings" and "power", where Leda is all sprawling limbs, "loosening thighs", and general lewdness. This too gives the swan the upper hand in status and respect, even without taking into account his maleness versus Leda's femininity.
See:
Analysis: Point of View