Final answer:
A therapist is generally not required to report consensual sex between minors who are between the ages of 16 and 18, depending on jurisdiction-specific laws regarding consent and the age of majority.
Step-by-step explanation:
The therapist is not mandated to report consensual sex between minors when they are between the ages of 16 and 18. It is important to consider the laws specific to each jurisdiction, as they can vary widely. However, most states have laws that recognize the capacity of individuals within this age range to consent to sexual activity with peers. The complexities around consent and reporting arise from the need to balance adolescent privacy, protection from harm, and legal obligations of healthcare professionals.