“Not only is cowgirl an option for anal play, but sex educator and self-proclaimed sex-hacker Kenneth Play, also calls it the perfect option. Especially for first-time anal-havers.”
“He explains: “When you squat, the pelvic floor opens up including the anal muscles he says. (Fun fact: that’s why most of our ancestors pooped and gave birth from a squat position). “Because it opens up the ass, getting the penis or dildo into the anus is far easier than it is in other positions,” he says.”
Read more about the cowgirl position in the article Why Riding In The Cowgirl Sex Position Gives The Best Orgasm