Here are some nice clips that I found. Someone hid a camera in the corner of a room and picked up a horny couple in action on the sofa.
The first clip just shows them kissing (Click here to view it),
but in the second one he gets a nice blow job (Click to view).
This one is my favourite though - she backing onto his cock for a nice slow fuck whilst he lies back on the sofa (watch it here).
You can get a much longer version of this session (and a lot more secret sex films) on
They didn't know - Click here for more samples.