Here is my thoughts, based on my own experiences.
I was a good child when I was 15... I listened to my mom for the most part, we had regular teenage parent angst problems, but nothing major. Then my mom let me have the house to myself for the Summer while she stayed in the next town over.
I had parties all the time (of which the cops came to once, and by miracle no one got tickets and they did not question why my mom wasnt there) I lost my virginity because I was able to have my boyfriend over without anyone watching us. I drank and smoked weed. I stayed up all the time and didnt do shit that I was supposed to. I went out cruising the streets to do nothing but drive around and be a teenager.
Well my mom wised up to me and I moved in with her and her new boyfriend... but the fact remained that I was a good kid that went wild unattended.
I am a good 23 year old now that can laugh at the things I did then, but things could of been much worse. I shouldnt of done half the shit I did then but ya know... it happened and luckily I didnt get pregnant, get hurt, or do anything else major.
My mom came home every week to check on me and give me food and money, but still... I would never do that to my kiddo and I have no idea what my mom was thinking at the time! Shes a good mom but we both werent thinking in that situation.