@malcolmbruce Is this still bugged for you ?
I left the household that had this problem again, and played other households. None of the other households had this problem. When I came back to the problem household, I deleted the telescope from the lot and moved the roommate out (note: the roommate moved in after the problem started and slept in the bed the woohoo couple would no longer sleep or woohoo in.
The problem started originally the first time the game was loaded after the 10/1/2014 patch was installed. The house has 2, nearly identical bedrooms on the second floor. No other beds on the lot. Now, after intiating woohoo thru chat, the sims go to their original bed, woohoo, and go to sleep immediately afterwards (note: their engergy was yellow. They do not go to sleep immediately after woohoo if their energy is not low). It has been working since removing the telescope and roommate.
Although I currenly no longer have the problem, I can't really say the problem is fixed since the cause was never identified, and i dont know if the changes I made fixed it or something else did.
