Sexy?

Why is it that my eight year old is obsessed with the word sexy? He doesn’t know the true meaning of the word. He thinks it means beautiful. He keeps saying, “Ohhhh, that is soooooo sexy!” or “That flower is SeXy!” I keep telling him that’s not really a word he needs to be using and he wants a better explanation. So I told him that it’s more of an adult word. He said, “It’s not a cuss word though.” I told him that it’s not a cuss word, but it’s just not a word he needs to use. LOL! It’s just hilarious to hear him say it. He says it like, “Sex-ay!”