It's not a rule, but I can't imagine going very far in a conversation in a social situation without bringing up my husband and kids. And if it's someone I'm interested in being friends with, TGIB gets brought up shortly after. Anything else feels like false pretenses at best. And trying to explain after the fact (cause it's a part of my life, it's GOING to come up if I'm good friends with someone) has way too much potential to BLOW. UP. If there's going to be tension or drama, I'd rather it be at the beginning before anyone's invested.
Pan Female, Hinge in a V between my mono (straight) husband, Monochrome and my poly (pan) partner, ThatGuyInBlack