What if you adjust for major? (Score 1)

An interesting followup might be to look at whether the student's major or area of studies had a relationship to his or her choice and the extent to which that choice was influenced by the treatment (exposure to attractive, as opposed to average, member of opposite sex).

I think that it's plausable that some relationship exits. For example, students of majors such as Actuarial Science, Economics, Statistics, Applied Mathematics, and the like would be more likely to know exactly how to make a rational choice in this case (i.e. maximize the net present value of their decision by discounting the future payment at a reasonable rate). This could easily influence their base odds of making the rational choice. An interesting question might be whether their ability to use their knowledge in the area would be affected by the treatment. If there is an effect, should workers be allowed to put on their cubicle walls pictures of members of opposite sex that are of only average attractiveness?

Of course, you wouldn't be able to demonstrate causality, since that would require randomly assigning students to majors.