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.