How to prove whether having sex in a hotel room is voluntary?

Whether it is voluntary or not can be proved by investigation and evidence collection and medical appraisal.

1. Investigation and evidence collection: If criminal crimes such as sexual assault and rape are involved, the police or procuratorial organs can conduct investigation and evidence collection, and find relevant physical evidence and witness testimony for judgment.

2. Medical appraisal: If injury or physical injury is involved, medical appraisal can be conducted to judge the degree and time of physical injury.