I'm not really sure. I started really getting excited by it when I was in about the 7th grade, and I've never been the biggest guy (probably 5'7" 135 lbs. around then, compared to 5'8" 155 lbs. during my adult life), so lots of girls and women have actually lifted me. some on their own, some through my manipulations!
I do recall getting a hardon and exploding in my pants when I was lifted once by a bigger girl who made me feel like I was weightless to her while wrestling around. Probably was 14-ish, then. Jerked off many times to the fetish after that!
