I am 16 and I am really thinking about having sex for my first time. I originally wanted to wait until I was married but now that I might have the opportunity, I don't know if I want to wait anymore. I have only talked to this guy a few times and he's not really my type but the more I think about it, the more I am getting curious what sex would be like with him. There is one more weird thing; he is in a relationship- open relationship- with my best friend. Finally, he is like ten years older than me. What should I do?