My parents won't let me have my boyfriend in my room, even with the door open and everyone nearby?

My boyfriend's coming over tonight and we were going to watch a movie on Netflix and my mom won't let me have him in my room so we can have a TV to watch it on.

The door would be open and we would obviously have clothes on.. so, yeah.

How can I get her to agree?
My parents won't let me have my boyfriend in my room, even with the door open and everyone nearby?
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