I suppose that one thing that has contributed to the long life and popularity of Swan Lake and other classical ballets is that they are very sexy. It is not only the aforementioned long-legged beauties in tutus. There are also the muscular young men. There is the constant temptation to pursuit and the constant resistance to capture. There are numerous embraces, in various postures. There is the distinct rhythm of the music. The sex is implicit but unmistakable.