Two people under eighteen shagging. Its way better under eighteen coz then if you get preggers you can get an abortion.
Me and my boyfriend was bunking a lesson and we fucked in the toilet. Now that mate, is proper underage sex.
the best thing in the world, probably before porn(for most people)
and a great way to waste time with your 'significant other'.
both participants must be under 18 or so of age.(depends on where you live)
two 15 year olds. fucking in the school toilet like rabbits in between classes then skiving off classes just to screw each other. THAT, my friend, is totally underage sex.