I was in my favorite bar last Saturday. Such a nice day I had to get my bike out and ride around. Any how, a couple of ladies were in conversation about their latest sexual relationship. One lady made a comment: he was pounding so hard he had her toes curled. My first time hearing that comment made. Do the ladies/females often get this reaction.
I've heard the expression before. And occasionally seen (and experienced) that particular physiological response.