I did this with my Ex and another of her Ex's, We hated eachother and we didn't "share" her we fought over exactly how she wanted 3 of us were naked she was between us on her back we approached from opposite sides and tried to enter her pussy getting in eachothers way. We had an all out cockfight against her vagina both try to push inside while pushing or slam you the other cock away. Eventually we both push inside and she told us she wasn't on anything and she want us to fight inside her! and we did. We shoved, nudged and wrestled with her stuck between us and cocks were at war inside pussy. We fought to over the focus of her attention.
You never know about women's secrets. I dated this petite conservative Asian. She loved having a dildo in the pussy at the same time. She finally confessed that her ex hubby used to DP her with other guys..I was blown away..