Not all of these paintings are in the "erotic" category, but most of them are of the NSFW work persuasion, and most of these paintings by Hubert de Lartigue are rendered beautifully. From full nudes, to an interest in belly buttons, to some very nice obsessios with tongues, de Lartigue uses acrylic on canvas for all these works.
Hyperreal Erotic Paintings by Hubert de Lartigue
