I have done that before, when I was a teenager. typically I had a very sore, puffy cock from a weekend of too much sex, first with a few gfs and then later with my wife. there was a lot of stroking and sucking on my cock over a 3 day period, especiallly one gf, she could suck cock. it would take a couple days to recover sometimes. my cock would totally hang almost full length flaccid, kind of puffy. gave me one hell of bulge in my pants. wife said it was visual turn on for her. after a year of marriage, the wife claimed that my cock was thicker than it already was, and longer. I don't know, never measured.