I hadn't had "the talk" and assembled my own understanding about marriage = "the ability to touch each other's private parts."

I remember thinking, at the age of probably 8 or 10ish, that a bride and a groom, after they were married, in their fancy full wedding outfits would stand on either side of the sink (specifically in my house's upstairs crappy bathroom with mildewy tile) and expose themselves to each other, and then the bride would reach across the sink and "tag" touch the groom's crotch and then pull her dress up, and... at that point I didn't really understand what she would "have" under her wedding dress, but I did assume the groom would reach over and basically "tag you're it" style touch her, at which point the act would conclude.

I didn't have a name for this act, but I was pretty sure this is what adults all did immediately after marriage, one time only. I didn't associate it with babies or anything, more a rite of passage.