At the end of the game, if you save the entire crew, you'll recieve an achievement and bonus for completing the suicide mission. When you have no "soul mate" you´ll get an e-mail from Yeoman Chambers after saving her from the Collectors.

This e-mail allows you to call Kelly up to your room when you access your COM unit on your desk and have no girlfriend attending you and not in a current relationship.

From there, Kelly will slip into a tin foil stripper outfit like you'd see Asari at Afterlife wear. And she'll dance in front of you as you sit on the couch or lay with you on the bed.

Each option will be highlighted when near them.