Rape in the middle ages was a punishable crime and most were committed against young women. On the other hand, it was not considered to be a crime for a man to take a peasant woman somewhere and rape her. It was allowed. Peasants, though, weren't the only ones who were raped. Noble women also were subject to this crime. They were often caught in crowded areas of the castle. Women could easily be raped in her own bed while her husband was away tending to his everyday chores.
It was a game for knights to seduce and abduct a woman of the castle. This was a test of the young knights valor.
Rape was very common in the middle ages. Punishments were harsh if the offended was found. Lack of medical technology, testing blood and bodily fluids was virtually impossible. The testament of a witness was the only valid trial.