One simple fact when it comes to attraction is that we like those who like us. Knowing that they likes us or think highly of us is one powerful reasons why we are attracted to someone. In a classic ...

"If equal affection cannot be, let the more loving one be me"—W. H. Auden Romantic love naturally craves reciprocity; yet not all forms of reciprocity are healthy. Some can, in fact, be toxic.

The principle of direct reciprocity, or paying back specific individuals, is assumed to be a critical component of everyday social exchange and a key mechanism for the evolution of cooperation. Young ...