i am very tall, but also have a shallow vagina. i always prefer hard, fast strokes but i'm in the average size penis club. i always say, i like my cervix to stay intact. and even for oral sex and anal sex, really large or long penises aren't appealing, to me anyway. my hubby is just under 7", probably 2 " maybe 2 1/2" radius, and he's perfect for oral and vaginal, almost too big for anal, for me, so as goldielocks would say "just right"
EDIT:hubby just came in and was reading my posts. lol...he was teasing my math. he is apparently 7 and 1/2 inches and according to his calculations :rollseyes an 1' and 5/8ths radius. good lord you men and your measurements.