echo. sex isn't priority one... If you can't find a safe place to be intimate together, then maybe it's not a good idea to be so concerned about it.
and for your bemusement, my first gf and I had a similar problem, only it wasn't finding a location, it was unfortunate coincidences; first her car broke down, her dad wanted her home right after work, her period started, then she had to move away to college. lol what a frustrating couple of weeks that was