Extra Big Dicks says: This scene opens at the end of Part 1 with Jacob Stax asking twin brother Michael Stax about what went on when he went into the exam room. Michael is not telling him details, but assuring him it will all be fine and he will like it.
Just then Sean Harding walks into the waiting room and asks for Jacob to come to the back with him. Once inside the exam room, Sean explains that he will be getting penis measurements for the Twins Study and for him to take his pants off.
Once Sean Harding gets the flaccid measurement he tells Jacob that it appears he might be a little larger than his twin brother and they so far he and Michael have the biggest penis in the study.