Often overlooked benefit of polyamory: takes some of the pressure off of introvert/extrovert pairings. Introverts can get alone-time while extroverts are with other partners.
I don't understand extroversion. So I feel the introverted sister. My older sister is more extroverted than I am and sometimes it gets on my nerves, because she's like "let's go out!" And then I say "okay where?" And then she's like " why do I have to come up with stuff all the time?" And in my head I exclaim ,"because your the one who wants to go out!!!!"