I'll keep this short — this book must've been useful in 1992, but reading this in 2020 is a waste of your time.
• In the introduction itself, you learn Mr. Gray has an over inflated ego (again, not per 1992 standards), but he does.
• He considers himself as the god of human behaviour and presents his theories/opinions as a matter of fact, etched in stone and that's just a repulsive trait any given day.
• Reading the book is equivalent to browsing the horoscope section in newspapers, where you are presented with vague, random, calculated datasets, where the brain is tricked into believing things it relates to and ignoring the parts it doesnt.
• I am not keeping this short. I should, but good grief, this book makes my blood boil.
Okay, one word summary: irrelevant.