I mean if we're being technical I don't think the Romans made any delineation between kids and adults seeing sexual artwork, even where they did have censors visiting houses. I recall reading some families had giant phalluses on the kitchen table "to promote fertility".

Correct. Phalluses were magical, basically. https://en.wikipedia.org/wiki/Fascinus

Like in the Renaissance, artwork and nude statues were common. Some of it sexual, some it not. You can find the same thing across the world. (See Lingam stones in India, neolithic phalluses in Europe, Phallic Egyptian deities, etc.)

LSL was a household name but was explicitly marketed to adults. Your overall point about the shift in culture is correct, despite the fringe exceptions KeeperOfTheGate brings up.

And BG3 is marketed towards children? It's 17+ on Steam. Leisure Suit Larry, with its zany, cartoony imagery, marketed alongside King's Quest, Quest for Glory, was certainly available and arguably marketed to children. My parents wouldn't let me get it, but I had friends who played it. (Maybe 5th/6th grade ages.)

The point again is not that things aren't more available now, or more explicit, or more degenerate. Everything has intenstified. The point is that the original statement, "that elementary school kids didn't have the ability to have sex with people in games 10-20 years ago" is just not true. I went back to the 1970s and 1980s with examples. Ten years ago was 2013. Do you really need a list of widely available games in ~2010 that had player fucking?