Parents VS boyfriend

Ruby
My parents refuse to let my boyfriend and I stay in a hotel room together, when we are with them. 
I have gone on many beach trips with my boyfriend of 2 year, and stayed in many hotels but the one time my parents are going too they won't let us. 
We are going to a different state for my sisters wedding, my mom said she would buy my boyfriend his own room. 
I'm 20 years old he is 24 we've been dating over 2 years and my parents won't budge. 
Are my parents in the right or wrong? 
What can I do to talk them into letting us? 

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