1. THE EAGER CHIEF: The Position: He’s standing on his toes while you’re sitting on a counter in front of him. The se x is usually spontaneous. Why It’s Risky: Most cases of penile fracture—ruptures of the blood-filled tubes in your ere ction—occur from very vigorous se x, explains Justin Lehmiller, Ph.D., who teaches human sexuality and psychology at Harvard University. If you’re sitting on a countertop and he misses your va gina either high or low, his unlucky pe nis has nowhere to go but into your pubic bone or the counter.
2. THE COWGIRL AND LEAN BACK:The Position: He’s on his back, you’re sitting on top of him. Rather than leaning forward with your hands on his chest, you lean way back. Why It’s Risky: Like an elbow or knee, his ere ct pe nis can be “hyperextended” (cringe) if you put too much or too frequent downward pressure on the shaft, according to a study from the University of California, San Francisco.