It's never too hard to find volunteers when it's a study of cocks and impulses. Doctor Harte has a study in mind and horny Chris is more than down for it, he'll always accept any opportunity to get his cock out of his pants. Hard working Erik isn't so sure to start with, but once those three boners are being jacked and sucked, their gooey precum filling each other's mouths, he's totally down for the test. It turns out the parameters of the study are real loose, no notes are even taken while the two candidates take turns to fuck that hot doctor ass. By the time he's taking their cum loads over his handsome face and jacking out his own fountain of splooge it looks like they might need to run the test again real soon.