That is just grazing the surface of what is wrong with an experiment like this. For example: - people may react differently to photos than they do to real peop

That is just grazing the surface of what is wrong with an experiment like this. For example: - people may react differently to photos than they do to real people - people may react differently in a lab than they do in a real life courting situation - people may lie about their attractions for unfathomable reasons - people may not even know what they are attracted to - the people in the photos can't necessarily fake emotions convincingly These kinds of issues confound most psychological experiments but you really can't dismiss them when it comes to sex.