Is it fair that I make my son pay bills because he's sexually active?

I got into an argument with my son about this. He is 17. Has a girlfriend he's been dating for a year. I found out they were sexually active. I didn't condone it so I gave my son an earlier curfew, took away some of his privileges, etc. I went through his phone when he was asleep and discovered my punishments weren't working as I rrad they continued to have sex but in the school bathrooms. I told my son of he's going to do adult things then he needs to start contributing like an adult. I make him pay the light bill. (He makes $12 an hour at his job so he can handle it.) My son speaks to me less and is always visibly irritated with me but I guess I'm just old fashioned. If you wanna do adult things then you're gonna get treated like an adult. I spoke with my counselor about this situation and she told me I shouldn't make him pay bills. But she didn't offer any solutions as to what else I could do.

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