I have never had sex before, but its looking like I will tonight for my first time with this girl I've known for years. I was wondering what kind I need to buy? I've checked the internet but can't really find an answer to my question. I'm of average length...about 5.25-5.6 in around depending on how hard it is. But I am about 8.5 in in length. It seems like a magnum would be too big around, but anything else would not be close enough in length. What kind should I buy?