Thumb Grips: Matching indents on a woman's lower back located on either side of her spine. This a genetic trait and they are sometimes also referred to as "Dimples of Venus," "Princess Dimples," or "Butt Dimples." Many people find them cute and sexy. They serve a functional purpose when a guy gives it to a woman doggy style and grabs her hips, making sure to press each thumb into each dimple to ensure the most secure grip for the ride.
When I saw her on the beach, I admired her
Princess Dimples, and when I got her back to my hotel room I couldn't wait to try those
Thumb Grips!
I started doing her doggie style and I quickly realized she was the one fucking me. She was rocking her hips so hard, I needed to use her thumb grips or she would have knocked me off the bed!
Here's a short thread dedicated to
Sexy Back Dimples.