I am sooo frustrated! 
I have 2 DCs, 18 and 15 and since bedtime became a thing of the past, DP and I have been increasingly struggling to find opportunities for our sex life. We live in a pokey little terraced house with thin walls and the DCs manage to stay awake far longer than we can.
At weekends, we always sort of hope their plans will take them both away from the house at the same time for long enough but once again, we've just been interrupted - DS was supposed to be out til 9 but changed his mind.
This must be a common problem - what do other people do? Should I have a word with the DCs? Can't quite think how to approach it ... do we put our sex life on hold til they leave for college? Brazen it out and if they hear us, tough?
I'd be grateful for any practical suggestions or general sympathy.