Dancing to a sexy song, especially an old sexy song, is probably all right as long as there aren’t any other people around, particularly any young people. But if young people are watching, attempting to get thoroughly enough lost in moving to the music to enjoy it, much less be any good at it, will be impossible. All that snickering will make you too self-conscious.
Plus, you know, sexy dancing is different these days. People put their arms over their heads and thrust their hips toward the rear ends of their partners as if they’re doing it doggy style, and really, I don’t want to see you doing that.