after gaining about 3/4" in length and probably the same in girth from 6 mos of jelqing, during the time my wife was pregnant, my wife noticed the diff when we resumed normal sex after the baby was born. after about 3 mos with my larger cock, she told me I was always her best lover, the biggest cock she ever had. she said she enjoyed my new size, but not to make it any bigger. she was aware I was still doing some jelqing. she told me I was big before and now she felt fully "stuffed", not uncomfortable but getting there. I told her as a man I wanted to continue and get the biggest cock I could achieve, that I wanted a longer cock. I continued jelqing, got a little thicker, not longer. anyway, about the time I quit, she was early 30's and her sex drive, which was always high, went into overdrive. lots of sex, cock worshipping.
that was 20 yrs ago. sex is very seldom now. she comments from time to time that I still have a big cock, and that she certainly didn't miss out on good sex.