Was I out of line?

My husband of 8 years (together nearly 10) was asking me what his code name should be. I asked him if he’s ever named his penis. He said no, what do I mean. I mentioned that I’ve experienced that in the past & he asked did you name your ex-boyfriends dick - I sad no & he asked did they name your pussy. I said yes & he got really mad. Stopped watching the movie we were watching & went to bed. I apologized & said I was sorry for bringing up the past. He’s still really pissed. I’ve come to terms with the fact that he has been with other people before me, & actually when we were first dating he cheated on me & I forgave him. I was just playing around about the name thing. Is it really that serious?