According to a Former Male Porn Star, Don’t Ever Break the Rhythm of Your Thrusts
It’s not creative. It’s selfish.

I was having sex with a man I’d just met. His name was Marco, and he kept changing up the cadence of his thrusts. He would give a few quick pumps, then stop, wait a minute, then start thrusting slowly again. Suddenly, he’d jab at me rapidly. I was getting really annoyed.