Code Name... Mom

Here is my dilemma -

I am a wife to a wonderful man, and a mother to 3 wonderful children.  At the moment, my daughter is thirteen years old, and going through a series of changes; Some of the changes being the sudden interest in boys. 

Tonight, a young man called my house and when I answered “Hello?” a young gentleman met me with a soft flirtatious “Heya”.  I then asked who it was, and he stated his name.  He then asked to speak to my daughter.  I handed the phone to her, told her the boys name and she then wanted to disappear into her room with the phone.  Unfortunately, in this house that is against the rules.  Phones stay in the main room, if you want privacy, you can seek out a corner of a not-so-busy main room.  (Yes, I’m a bit old fashioned.)  She got all embarrassed, and the young man actually hung up when she went to answer his call.  After about an hour of some light teasing, the conversation ended up involving my daughter – trying to explain to me that she is “dating” this boy.  This seventeen-year-old boy.  She has only talked with him on the phone, but had plans of “hooking up” with him this weekend while she stays at her biological fathers house.  I called the young man, and explained to him that she is too young to be “dating” a seventeen-year-old (or “dating” at all), and that I believe that even if she didn’t realize that – he should have.  He acted as if it was no big deal, no issue with her being thirteen – at all.  I have placed her on restriction, called her biological father, and tried very hard to explain to her why this was inappropriate.  I don’t thing she got anything from the conversation except “This will not continue – he is too old for you.”  Some great advice would be so appreciated to a mom who is so lost.