Cuckolding?

So recently my husband randomly said “and I don’t understand cuckolds, like people who watch their wife’s have sex with other men”. I mean it was out of nowhere and out of context to our conversation. It caught me off guard with how random it was. We weren’t even talking about sex at all. So I was wondering if that could mean he is looking into it or curious of it?.. 🤔 it was just such a random statement.