We have a 15-year old son who is dating a female older than he; we think she's 18 years old, but have yet to confirm her age. Our son met this girl in high school and continues to see her secretive. Evidence has proven that this girl has been in our house without our knowledge or permission and has had sex with our son. We talked to our son about this issue and he denies everything. We talked to our son about our concerns with him seeing an older girl and experiencing adult activities; again, he denies and doesn't want to talk about it. Only recently, our son's cell phone was taken from him for not following the rules of the house. We browsed through his cell phone directory, read many text messages, and found the most disturbing photos of our 15-year old son and this girl completely naked and having sex; she snapped the photos herself. We reported the incident to our family therapist, who in turn is required by law to mandatory report the incident to the authorities, which they did. If this girl is 18, we don't want to ruin her life with an arrest as a convicted felon; however, her illegal involvment with our son MUST stop, and if it continues, we'll then proceed with filing charges. If this girl is not 18, but rather 17, do we have any rights to protect our son against having sex at such a young age of 15?