So I know I cant punish my 18 year old, but what can I do?

My son is 18 hes in high school. His girlfriend is 23 in grad school. He's very popular at his HS- he's on the fb team. Recently the school called me to notify me about a leaked video circulating. His girlfriend was using her smartphone to record him eating her out and riding him. In the beginning he asks "Are you sure you wanna record" and she says "mhm its hot" before it all starts. I didn't have a conversation with my son yet because I don't know how to start it. Personally I do want to punish him because he's still a high school student and if you're in high school, you really shouldn't be doing all of that.. But I know people are gonna tell me hes 18 hes grown so I'm not gonna discuss my personal feelings any further. How can I approach this? Or do I just leave it alone because he's an "adult"

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