How to Make Doggy-Style Even Cooler

4. Be careful with wild thrusts. Deep penetration can cause not only euphoria but also painful sensations for the partner. Here's why: The length of a woman's vaginal canal shortens due to the particular angle of the pelvic bones. The penis of an eager man strikes forcefully against the cervix, causing the woman pain. In this case, the size of the penis really matters: the larger it is, the higher the risk of uncomfortable sensations and even injuries for the partner. It's worth noting that the man himself can also suffer in the throes of passion — doggy-style accounts for 41% of penile fracture cases. Before letting loose, choose the optimal angle and depth of penetration and ensure that neither of you feels discomfort.