Men were more likely to see expectation of monogamy as unrealistic.Two in five men said that humans are not suited to monogamy.

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Slightly less women (28 percent) saw things the same way.

Males said they were most likely to have an affair because they wanted a new sexual experience or because they were not satisfied with the amount of sex they had.

Come January, the “Westworld” concept of lifelike sex robots will get one step closer.

That’s when a San Marcos company will unveil Harmony, an anatomically correct sex doll with a patented animatronic talking head with programmable personality and memory.

“Interestingly, two thirds of couples told us that they have watched porn together at least once," the study authors said.

Of those who do watch porn, 75 percent said they choose to watch free material available on the internet, 18 percent said they buy DVDs, 10 percent said they buy porn mags, and 10 percent said they buy raunchy books. Every third German man said he could imagine having sex with a robot, if it were technically possible and as long as it would feel real.

And women’s advocates say owners could realistically rehearse plans for violent sexual acts with the interactive dolls.

But Mc Mullen, the CEO and creative director for Realbotix, a subsidiary of his doll-making factory Abyss Creations, said critics of Harmony have it all wrong.

Some 17 percent told the authors that they had enriched their love life with role play, 16 percent had gone in for a “jaunty threesome”, 7 percent had tried group sex, and 6 percent had tried partner swapping. Quite a lot of Germans admitted to being unfaithful.

One in three said they had cheated on their partners.

News of creator Matt Mc Mullen’s latest invention — he’s been making lifelike silicone sex dolls for 20 years — has created international media interest and a firestorm of criticism from ethicists and futurists who see a dark side to a sex doll that becomes more “human” with each technological innovation.