When in Rome, do as the Romans do
Idiomatic translations of "When in Rome, do as the ..."
Meanings of "When in Rome, do as the ..."
to put aside ones typical behavior, morality - to go outside your normal standards and act out in the manner of local traditions or behavior - to let go and relax and go native and allow yourself to do what you may not normally do.
When you are at some place other than your own you should follow their traditions