Teenagers who are sexually active are at a greater risk of losing which benefit

Reproductive health.

Explanation:

The idea is that any individual will only begin to engage in sexual activity when their body has completed all training processes and reached a healthy sexual maturity.

Teenagers have not yet reached the full development of the body. Their bodies are still in formation and adolescence is a moment of constant transformation of the organism. For this reason, adolescents who are sexually active may lose the privilege of reproductive health, because the sexual act can harm their bodies in formation and development.

you would need to check her bp before and after her activity.