At first, the couple laughed, but when she developed a headache, they went to the emergency room.
"There is no way I am going to explain this," he said. "Either way, if I say she fell, it looks like a beat her. If I tell them it was sex -- well, I was not so giving of the truth at the time."
Dr. Moskoff said he is surprised that Gregg and the other characters on "Sex Sent Me to the ER" are unabashedly telling their stories.
"From my point of view, I don't get it," he said. "For someone to get up there and say, 'I did this crazy thing on national TV -- it doesn't make sense to me. It's their 15 minutes of fame. … I am guessing they have been telling these stories their entire lives. Why not tell it to a broader audience?"
For Gregg's part, he said he has always been a comedian, probably because of his size.
"I got on a stage in a penguin suit, so there is no concern for me being embarrassed or ashamed. It's not my style," he said. "I love to make people laugh."
Today, Gregg is 28 and a project manager for a marketing firm. Since his sex accident, he said he has lost 220 pounds and had skin reduction surgery. He keeps fit as a part-time Zumba teacher and kick-boxing coach.
His girlfriend is now with another guy, but Gregg and Jen are still friends. She doesn't mind the publicity, he said.
"Her boyfriend is fine with it," he said, "and she likes to laugh, too."