Will Whitehorn, president of the company, said the approach of Virgin's first planned space tourism flight, which is expected to take place in 2009, has led to many curious couples asking the company about sex in sub-orbital zero gravity, The Telegraph reported Thursday.

"We've had a variety of people inquire about it," Whitehorn said of space sex. "One got in touch about a charter flight so they could be the first to have intercourse in space and get in the Guinness Book of Records."

Dr. James Logan, an expert in space medicine, said the zero gravity portion of the first space tourism flights will last only five minutes, leaving very little time for intercourse. He said couples would likely find sex without gravity to be more trouble than it's worth.

"Sex in zero gravity would more or less be a flailing exercise quite frankly," he said. "Sex in Martian gravity might be pretty appealing though."