I'm 19 years old. About 2-3 weeks ago my older brother who is 23 approached me and asked if I would be comfortable with him seeing me naked. I didn't understand at first but once he explained it made sense. I agreed as long as he got completely naked too. He admires my body. I admire his. Nothing's ever happened between us, nobody's ever crossed the line. Is it normal that we do this at our age? And is it going to lead to other stuff?