Good Relationship/Psychology Books?

So I've heard of the book "Men are from Mars Women are from Venus" or whatever its called. I've always been into self help/motivational books for business, but I'd like to switch it up. I want to learn more about the psychology of relationships and of men and women in general. I want to be able to know exactly what's happening in my communications with women and in my relationships with them.

Should I read the first mentioned book? Any suggestions that might be better?