'Bonk' Writer Offers Hubby for Sex Research

June 11, 2008 — -- Mary Roach goes all the way for scientific research.

In 2007, she had sex with her husband while a British doctor waved an ultrasound wand over their private parts testing their genital responses to the soundtrack of "Les Miserables."

Her compliant husband — innocently lured to London with the promise of "an all-expense paid trip" and a day at Stonehenge — rose to the occasion with a dose of Viagra, she says.

"It was a weird mix of medical procedure and sex," Roach, who took copious notes throughout, told ABCNEWS.com. "Ed said afterward, 'I was really creeped out that I did this.'"

It was all for the sake of Roach's new book — "Bonk: The Curious Coupling of Science and Sex" — which reached #10 on the New York Times bestseller list this spring.

"He's such a good person," Roach said of her husband, a graphic artist. "Mary needs this for her book, I will ejaculate."

Not since Masters and Johnson wrote "Human Sexual Response" in 1966 has the physiology of sex been explored in such detail. Until their groundbreaking study with married couples, researchers would "simply, quietly do it themselves."

In the case of London's Dr. Jing Deng, who studied Roach's sexual response, he wanted to capture "real-time, two-party human coitus," but he couldn't find takers. She volunteered.

"It's one of those things you agree to, and you're not really thinking it all the way through," said Roach. "If my husband had been thinking it through, he would have said, 'No!' The burden of performance was on him."

She even participated in an arousal study at the University of Texas at Austin. "It was not particularly demanding," Roach said. "I had to sit in a chair in a room with no pants on with a seismograph and was a control subject watching porn."

The 49-year-old is no stranger to strange topics. She has written about Eskimo food, flatulence, vaginal weight-lifting, carrot addiction and amputee bowling leagues. Her two previous books also explore oddities with humor: "Stiff: The Curious Lives of Human Cadavers" (2003) and "Spook: Science Tackles the Afterlife" (2005).