My younger sister wants to become a porn star?

My younger sister Katherine who is 15 told me she wants to be a porn star. I was shocked and baffled by her aspirations. She told me she thinks it's so cool to get paid for having sex. She told me she thinks it's hot that all these guys watch you having sex. I had no idea what to say. I would had to see my sister with some potential throw he life away in such a sleazy business. What should i do?