Asking my boyfriend about his penis size.

So I’ve been dating my boyfriend for 2 months now. We’ve sent each other pics of our parts and now I’m curious to know how big his penis really is. I’ve seen it but i don’t know how big it is in inches. I want to ask him but i don’t know if that would be wrong. It looks pretty big in the pictures and I don’t necessary care about size I’m just really curious. So should I ask him or would it be wrong.