Tallest was 6'11", a college basketball player. Had average size cock for his size though about 7" which was fine because once he wrapped his dinner-plate size hands around my waist I was totally turned on. Also, he had a great body; flat stomach, nice arms and pecs, etc. He was only 19 and I was 31. I taught him way more than his basketball coach. Perhaps that is why he spent about 30 seconds in the pros?
shortest guys were about 5' 6" and one who was a tripod, his dick looked like a firehose
(BTW I'm 5'3")