That's kind of a crappy situation. When I went to visit my gf the first time, we were at her parent's house. But, luckily, her parents aren't fools, and didn't seem to care that we were sleeping together. If you're being forced to sleep seperately (whether in another room or in a hotel) you just need to find the time to do it. Do it really late at night, when everyone is asleep. Honestly, if you guys are that old, it's really bad that your parents would have enough control over you to dictate where you guys are all the time. Surely you'll have some alone time.
I'm drowning in assholes.