Mary Sharpe: "..makes us want to do it again because that’s part of dopamine’s reaction, it is very addictive and it promotes craving behaviours. Now unfortunately it’s not just craving the love it’s craving the dopamine and just like in many other aspects of addictive behaviours, it’s the dopamine we’re after, it’s not the chocolate cake, it’s not the gambling per se, it’s not even necessarily our love interest, it’s the fix or the hit we get from the dopamine." continued here