Indecent Experiment (3 Book Series)

From Book 1: Broke college coed Karen just needs to make a quick buck, so she agrees to participate in the medical study. When the indecent nature of the experiment is revealed, she almost walks out, but an obscene amount of money, and a smoking hot doctor, tempt her to stay.

When they roll out the huge, robotic contraption, will Karen back out, or will she decide to strap in and enjoy the ride?