All these paintings are over 100 years old and in Public Domain and shown in musea worldwide. Cherubs etc are not to be tagged as shotacon or Leda and the Swan going at it is not to be tagged as bestiality.
Nice, you've saved us a couple of museum tickets. Very educational, but sadly not very hot, I think. And you left out the best one: https://en.wikipedia.org/wiki/L%27Origine_du_monde