Horniness is about how the camera treats the character, more than the specifics of what they look like.

Consider what's centred in frame and how the character is posed not necessarily what they're wearing. (If you want an example of an entire film where most of the central cast is female, extremely attractive, wearing about one set of clothes between eight, and is never actually horny, then rewatch Mad Max Fury Road.

If it's animated then consider how the camera moves around the character as well.

That lets you know what you're supposed to find significant about the depiction.