My girlfriend IRL is a single, working mom. Her 14 year old daughter is home alone for a few hours at the end of the day, between the time that school gets out and her mom comes home from work. She's just a tad too old for a babysitter or afterschool program.
The rule is: no guests, especially boys. So far so good.
A mom in Teenage Daughters and the Drama Ages 13-18 thought she had that rule pretty well instilled, too, until a neighbor caught a boy leaving the house after school one day. He claimed he was just there get homework help, but his mom found out it was much more than that. Yup, he tried to convince the 14 year old girl to have sex with him.
Needless to say, the girl got a tanning, a grounding, a new babysitter, and a whole lot of privileges taken away.
Have you ever caught your daughter alone with a boy in the house against specific orders? How did you deal with the fallout?