…and we knew it all along.

Call me heartless, but sweet, lovable, teddy bear boyfriends are nice to have around but usually too boring to keep around. According to an article published in The New Scientist:

The traits are the self-obsession of narcissism; the impulsive, thrill-seeking and callous behaviour of psychopaths; and the deceitful and exploitative nature of Machiavellianism. At their extreme, these traits would be highly detrimental for life in traditional human societies. People with these personalities risk being shunned by others and shut out of relationships, leaving them without a mate, hungry and vulnerable to predators.

But being just slightly evil could have an upside: a prolific sex life…

Sorry guys.