I suppose it depends on the teenager. For example there are some 17 or 18 year olds I know that I wouldn't mind going out with my 15 year old DD. But would the fact the older one is legal and the younger one isn't worry you a lot? Do you think the fact one is legal and the other isn't means that they'd definitely have sex illegally? I just need some advice on this, and would be grateful to know what you think.