In a video released Monday, writer Mary Roach attempted to sort out who has better sex: gay or straight couples.

Roach is a columnist and the author of four popular science books: Stiff: The Curious Lives of Human Cadavers (2003), Spook: Science Tackles the Afterlife (2005), Bonk: The Curious Coupling of Science and Sex (2008) and Packing for Mars: The Curious Science of Life in the Void (2010).

Roach referred to a Masters & Johnson study from the 70s to answer the question.

“This was the only study I came across that was really a qualitative look at sex. Like who's having better sex and why. And, in fact, the best sex was being had by long-term committed homosexual partners,” Roach said.

“Two things going on. One was something called gender empathy, which is if you have the same equipment you kind of know intuitively what feels good.”

“The heterosexual couples were tending to do things to their partner that they would want done to themselves, which didn't always play well. And there was also a sort of mechanical element of, 'Well like if I twittle this for about ten minutes that should be good for her.' … They weren't losing themselves in the experience.” (The video is embedded in the right panel of this page. Visit our video library for more videos.)