Is this man. ron jeremy. the most famous porn star in the world. so, what can i do for you? reporter: ron got started in the porn biz in 1978 when he and his then girlfriend sent pictures to playgirl magazine. since then he appeared in thousands of adult films. i can do anything i want. reporter: a porn star into nonporn roles and cameos in music videos, including kid rock s cowboy. while ron has had sex with countless women on screen and off, craig has only had sex with one, his wife of 15 years, jeannette. i ve been with a couple thousand women and craig has been with his wife a couple thousand times. same thing. reporter: they met at a porn convention seven years ago. they eventually started debating one another on college campuses about the pros.