Diana and Endymion Louis Jean François Lagrenée (1725-1805)

The picture has something of this: nude, man, reclining, people, water, woman, leisure, affection, recreation, shirtless, love, beach, two, son, child, relaxation, outdoors, intimacy, seashore.
Perhaps it’s a painting of three naked men and a woman sitting next to each other on a bed with a blue blanket on top of it and a tree in the background.