Updated

The average single guy might jump at the chance to bed a Hollywood starlet. But if that guy is James Franco, and that starlet goes by the name of Lindsay Lohan, nobody's jumping anybody. Period.

Back in March, published a list, written by Lindsay Lohan, featuring the names of 36 male celebrities Lohan said she had slept with — a list which she later owned up to, claiming that it was part of her 12-step treatment at the Betty Ford Clinic (despite it looking more like a repurposed page from a Scattergories notepad). Among the dozens of recognizable names on this list was James Franco, the 36-year-old actor known primarily for his roles in "Freaks and Geeks," "127 Hours," and "Spring Breakers."

There's only one problem: Franco claims he never slept with Lohan.

During an appearance on Howard Stern's SiriusXM Radio show on Wednesday morning, Franco swore up and down to that very fact. "It’s a lie," he told Stern. "I will swear on my mother’s life that I never had sex with her."

Franco did, however, admit to making out with Lohan all the way back in 2004, when he was filming "Spider-Man 2." "All right, we maybe kissed," he said. "It was lame. I can’t believe she put me on that private list, she’s so delusional!"

The actor then told Stern that he tried to maintain a friendly relationship with Lohan when they both lived at L.A.'s Chateau Marmont hotel some years later, but ended up keeping her at arm's length when it became "pretty damn clear" that she liked him. He added that once, Lohan even let herself into his hotel room, unannounced, at 3 a.m., just to hang out. (He ended up practicing his poetry assignments with her instead of asking her to leave.)

Franco also recalled an occasion in which Lindsay came down to observe one of his acting classes, only to sit in the back and rudely critique the actors' performances. And that's when Franco delivered an ultimatum: either shut up, or leave.

It's no surprise, then, that Lohan gets two mentions in Franco's new book of poetry, "Directing Herbert White." After all, he's known her for a long time, just not in the Biblical sense.

What do you think? Do you believe him?