The Position: You’re standing on your toes while she’s sitting on a counter in front of you. The sex is . . . spontaneous.
Why It’s Risky: Most cases of penile fracture—ruptures of the blood-filled tubes in your erection—occur from very vigorous sex, explains Justin Lehmiller, Ph.D., who teaches human sexuality and psychology at Harvard University.
If your partner is sitting on a countertop and—in your enthusiasm—you miss your target either high or low, your unlucky penis has nowhere to go but into her pubic bone or the counter.