You may only enter as data the following facts

Andy and Jeff are dating.
Andy and Kathy are dating.
Kathy and Dave are dating.
Kathy and Steve are dating.
Dave and Sally are dating.
Sally and John are dating.
Kathy dates Ryan.
Ryan dates Jeff.
Joanna doesn't date anyone.

Andy, Jeff, Dave, Steve and John are male.
Kathy, Joanna and Sally are female.
Steve has pink eye.
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Questions ....

Who is Kathy dating?
Who is competeing for Andy's affections?
Who's straight? 
Who's not. 
Who's flexible?
Dating someone with pink eye gives you pink eye.  Who has pink eye?
People who only have one date are 'picky'.  Who's picky?
People who have more than two dates are 'friendly'.  Who's friendly?
Who's flying solo?