Actually the testimony of the two that came upon them was that the man was fully clothed and that his genitals were not exposed. I also read that neither were her genitals exposed. He was found innocent of rape and it is probably based on these two facts.
From the daily mail article link in 64:
“He recalls that her dress was pulled up and she was naked from the waist down. “
That doesn’t fit with no visible genitals.