Pretty sure a first lady existed some 100-million years ago, who I'm sure doesn't get nearly the respect she deserves for very successfully performing her basic biological functions, and can be respected for the fact she fucked someone, but it does seem weird to worship someone modern merely because they've fucked someone else long after that first time.

At a species-level, a woman managing to fuck someone with political power isn't terribly rare, unusual, or impressive. But it is a goal of many of them. Maybe the "first lady" thing is a form of idol worship over someone who managed to complete their goal of fucking someone rich or powerful?