Vagnus
When the layers of skin between the females vagina and anus otherwise know as her  taint  tare and become one this is known as  Vagnus . This can be the result of having extremely rough  double penetration  or very large penises in both holes.
After I had the most vigorous D.P. a.k.a  double penetration  session I had ever had before, the doctor had said the two very well endowed gentleman had caused the most severe  Vagnus he had ever seen.