The 34-year-old from Australia argued that monogamy is “not in our DNA”.
In fact, she citied a study which states more than a third of marriages are affected by infidelity.
She pointed out that one in five of us are cheating on our current partners right now.
“Marriage is for idiots”
In an article for She Said, she wrote: “Marriage is for idiots. It’s not natural to have sex with the same person over and over again.
“It’s not because we’re cold, unfeeling creatures incapable of love – conversely, human beings have the capacity to form incredibly meaningful, complex connections with one another – it’s simply that fidelity, at least not the kind that lasts decades, isn’t in our DNA.”
Nadia – who previously opened up about her sex obsession – said the institution of marriage doesn’t align with our modern values.
The sex expert told Daily Star Online: “I don’t think the institution of marriage will exist in another few decades’ time.
“We are already seeing huge cultural shifts toward non-conventional relationship models like polyamory and people willingly remaining single long-term. Marriage makes no sense in our modern society.”
“That’s not to say I don’t believe in love and monogamy – I really do, and am in a happy monogamous relationship at the moment – I just don’t see any possible sense or benefit to having another person ‘own’ you.
“Marriage is sexist and wildly outdated.”
Nadia also has a problem with the role that money plays in marriage.
She wrote on her website: “As long as you don’t mind putting your entire financial stability on the line for someone else, who statistically has a 33 per cent chance of screwing you over.
“Think of it this way: would you purchase a lotto ticket if there was nothing significant to be gained if you won, but if losing said lotto meant potentially forfeiting HALF your assets? No. And you’d likely view someone who did as a fool.”
She reckons the idea of finding one person that she will spend the rest of her life with is a fantasy.