Well, nowadays you don't hear of cats being called pussycats (beyond Josie & The Pussycats, Tweety Bird's infamous catchphrase, and The Pussycat Dolls), do you? The point of this is that terms change with the times. For example, the word "gay" used to be a synonym for the word "happy", but nowadays, it's just largely considered to be a slang term in regards to homosexual males.