Levinson (2005) makes a useful distinction between erotic art and what he calls erotica, that is, images intended to sexually stimulate but not to reward artistic interest (such as provocative lingerie ads). In general, it is good to keep in mind that the domain of erotic art only constitutes a small subsection of the much larger class of items that are called erotic (erotic massages, erotic games, erotic toys, etc.). Erotic art also seems to fall within the broader category of sexually themed art. All works of erotic art have a sexual theme, it could be argued, but not the other way around: many artworks with a sexual theme are not works of erotic art. Ian McEwan’s On Chesil Beach has already been mentioned.  Another example might be Tracey Emin’s Is Anal Sex Legal? (1998), which simply consists of that question writ large in pink neon light. (The piece is usually exhibited together with its complement, Is Legal Sex Anal? also from 1998).