I don't think there's any rule that says most are introverted, though this poll shows otherwise.
I, myself, am extremely introverted and more so as I get older. My ideal evening is a glass of wine and a good book with my husband beside me, and my daughter playing nearby.
We rarely go out, though I do love a nice dinner out once in awhile.
Aside from family and a few close friends - by few, I mean...I have 1 friend I get together with for lunch or dinner maybe twice a year, and my husband has a couple friends he knew in high school that we still see maybe once a year...we really aren't social. We're both happiest at home, or at least, alone together. Camping, fishing, whatever.
I prefer online communication to in person or on the phone.
*shrug*
I'm like a hermit...who's female...and married and loves sex (with the husband).