If eroticism represents a kind of beauty - though of a more alluring, provocative sort, and one that can engender a certain longing or desire - then erotic works actually can be seen as a "subset" of art in general. And if artists don't view their subjects as erotically beautiful - don't in some way betray their love (even lustful adoration) for them - it's unlikely that you'll be so moved either. But assuming their creative intentions have been realized, you may be made privy to a joyful sensuality that feels at once exciting and enriching.