What does it feel like?

So I am not on birth control and never have been. Just a personal choice I have made for myself. My boyfriend and I use condoms and so I’ve never ever experienced what it’s like to have him finish inside me. I’m sure I’ll find out sooner or later if and when we decide to have kids, but I’m curious.

Is it warm? Weird feeling? One of my friends said it burns. I’m just genuinely so interested.