So I'm not very experienced in sexual things, and neither is my boyfriend. We've talked about a few things that we like and don't like, but I'm still nervous. He likes it when I bite his neck....like a lot. The first time I did it he was shaking a lot and breathing heavily and all that. At first I thought it was hurting him, then he said don't stop and wanted me to bite harder. I still can't help but feel like I might hurt him by doing this. I'm also nervous because I think he wants to start having sex.. what do I do??