Is it fair that my parents won't let me bring my boyfriend in my bedroom at 21?

Im 21 and sometimes i just want a quiet comfy place to talk with my boyfriend. i dont mind if the door is left open. and before anyone says their house their rules, I've seen my brother in the past bring his girlfriend in the room while my parents were there. Guess what they didn't say anything. Note that im the youngest child among three. They like my boyfriend so they really just illogical. When i ask my mom she just doesn't really want to discuss with me and says because i said so or because i dont want someone in my house while im doing chores. These just sound like lame excuses. Dont suggest cafes, bars or parks etc done that been there. Im talking about something else.

Parents are right
Parents are wrong
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Is it fair that my parents won't let me bring my boyfriend in my bedroom at 21?
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