She probably has a yest infection; which can be caused by "excessive use". In other words, he bangs her hard and over time, may have caused irritation. Had that happen to a g/f once. We abstained for about three weeks but from what I was told, some docs recommend abstention for as long as 6 weeks.
Or...he withdrew from the Hershey Highway and somehow her chocolate got mixed in with her the peanut butter (peanut butter because her legs spread easy).