You don’t have to be a porn star to expose your artistic endowment. The World’s Greatest Erotic Art of Today competition (www.eroticsignature.com) wants amateurs and pros to help fight HIV by submitting up to three pieces about anything sexual, from photos to sculpture, by October 1. Winners receive up to $10,000, and the top 200 pieces will get laid out in a glossy book with all profits benefiting AIDS charities. The rules are that there are no rules (but no animals or minors, please).