A lie detector test should be a first requirement on all such cases of she said - he said. Just the threat of it might be enough to minimize this BS. False accusations should lead to the same sentence applied to accusers as to those they falsely accuse.
This happened to a friend of a friend years ago.
There were four other young men over the past year and a half before, accused of rape by this unstable 20 year old who would pick up men, sleep with them, then cry rape when they didn’t want her to be a girlfriend and agree to see her in the future. When the rape kit came back from this instance I know, there was semen from several other men. I hope she gets what she deserves in life.