The topic you've requested relates to a tutorial by Kate Carl, a well-known author and sex educator, who has written about various aspects of human sexuality, including BDSM and anal play. Pegging is a form of anal play where one partner penetrates the other using a dildo or prosthetic device, often attached to the penetrator's body.
The tutorial you're likely referring to provides guidance on how to engage in pegging with a focus on prostate penetration. Prostate play, also known as prostate massage or prostate stimulation, involves stimulating the prostate gland, which can lead to intense pleasure and potentially powerful orgasms.