going with bfs family on vacation.

We are 20 and have been dating 3 years have slept together before (not at homes) and are waiting to have sex. I dont feel comfortable sleeping with his mom or little cousins. I posted this yesterday and people said to respect their wishes but if they know we wont have sex does that make a difference? They know we have stayed together at colleges. I dont want to miss out but want to sleep where I feel comfortable