may i answer that one? the slutty act of seeing a girl with another man, watching how she reacts and act different with a different guy, watching her in action, getting to see her hot facial expressions and body from different views..just the very idea of her doing something slutty, the idea of letting your girl have that freedom and satsifaction of watching her get off and being free...so many reasons...a lot of men have this fantasy, it's pretty intense for me anyways..mostly the visual aspect of it..guys are very visually stimulated, the mental aspect of it would be like i said, the slutty idea of it and letting your girl enjoy herself and give her that freedom.etc etc