LOS ANGELES - He claims to have saved hundreds of thousands of marriages. But John Gray, author of "Men are from Mars, Women are from Venus," is worried by where relationships are going - notably online.
Free Internet porn is "like taking heroin," while online cheating websites can also lead to sex addiction, Gray said.
Gray, whose books including the original 1992 classic have been published in 50 languages and sold 50 million copies, is also worried about feminism, which he blames for spiking divorce rates.
"The reason why there's so much divorce is that feminism promotes independence in women. I'm very happy for women to find greater independence, but when you go too far in that direction, then who's at home?" he asked.
In an interview with AFP, Gray said widespread feminism in America holds back sales of his books here, while other parts of the world -- he cited Australia and Latin America notably -- are more in tune with his basic message.
Men and women come from different planets, and the two sexes should stop trying to behave similarly, and embrace their own natural personalities, according to Gray.
"The most resistance I get to my message is in America. Wherever feminism has a strong hold, there's resistance to the idea that men and women are different," he said.
"When you go to Australia, for example, there's a very clear knowledge that men and women are different."
Gray also cited Latin American countries as places where "they love my books."
In Europe, he said his biggest fans are in France.
"I think it's because France is a romantic country, the language is more romantic, people care more about relationships," Gray said.