Mainstream credits: Saving Private Ryan (1998), Black Hawk Down (2001)
Adult credits: The website
Circumstance: Mainstream actor turned self-manufactured adult film star

Tom Sizemore—yes, that is his real name, it just happens to sound like a porn name too—is an esteemed character actor whose personal life has been a well-documented train wreck of drug addiction and legal problems. In 2004, evidently at the end of his rope, he tried to launch a career in homemade adult videos, setting up a website featuring clips of his escapades with women—perhaps hookers, perhaps porn stars, but the consensus of people who viewed the material is that they were rented in some way or another.