The law does its best to define consent. A commonly held belief in the scientific, legal, and public communities regarding sexual consent is that physical injury (both genital and extragenital) is indicative of nonconsensual sex. Consensual nonconsent is a kinky sexual practice that is becoming more popular, even though it can be dangerous and must be done quite carefully.
Understanding Consensual Non-Consent(CNC): 5 Key Things to Know
Here's how to do it safely.
Specifically, there is scarce literature on determining whether consent was obtained by the accused from the complainant in a sexual assault case