Is it normal to slip out?

Don't worry, you're not rejecting it. You just need to make sure that you don't have it withdraw that far when he is thrusting. It has happened with many people sooner or later.

It happens, if things get wild, but not often. What is happening here is not your fault, it is his. He isn't experienced with the length of his stroke, so he pulls too far out. He will do better in time.

Omg this is really good because I had the same exact problem. No joke like right when we got it in and started it fell out. It's annoying so I know what you are going through. But trust me try it again because for me the second time was a lot better then the first. I think nerves had a lot to do with it, but the second time there's less pressure on both of you. Its fine there's nothing wrong with you at all. I promise it was your first time so your okay.

Normal. I hate to say this but, it is just from being inexperienced that's all. Don't worry.