When I’ve hooked up my dick hits a wall and I’ve been told to stop right then and there (I do) or to do it harder. How do I know what to do without potentially hurting the girl?!
You ask her. For some women it hurts and they want you to stop and for others it feels good. When you get to that point ask her if she’s ok and she’ll tell you but the most important thing for you to do is listen to her