In the first chapter of his 2003 book The Essential Difference, he discusses the bestseller Men Are from Mars, Women Are from Venus, written by John Gray in 1992, and states: "the view that men are from Mars and women Venus paints the differences between the two sexes as too extreme. The two sexes are different, but are not so different that we cannot understand each other."
The author challenges the extreme view presented in John Gray's book "Men Are from Mars, Women Are from Venus," which posits a stark divide between men and women.  He emphasizes that while there are distinctions between genders, these differences don't necessitate an insurmountable gap in understanding.