Who says thirteen is an unlucky number? Now, in the newest installment of the Letters to Penthouse collection, you'll thrill to the good fortune of those willing to share the most lurid details of their sexual exploits. Hear readers of the world's most uninhibited and provocative lifestyle magazine talk about sex at its wildest and its hottest, in every possible combination, and in every imaginable position. Excitement and libidinous satisfaction are a sure bet. Just open any page. And jump right into the fun.