tell em hell no. i had this fight with my teen age daughter (she's 25 now) and her friends. what a nasty fight that was!!!!
they think they are all grown up....
go out with them. always. thats a father who has a lot of experience along these lines.
especially with friends. what do you tell their parents if something happens and you let em go on their own in a country they don't know much about? i never could come up with anything for that....