in addition to what zam said turtling typically happens after a pe workout (particularly a stretching workout) as a bodily defense against the strain you have placed on your penis. Now on here you will hear the phrase, "don't let it turtle," which is referring to not letting your penis shrink up after a pe workout because when the penis starts to heal it will heal in that shortened state which will not help with gains. That's why you want to use an all day stretching (ads) device so that your penis stays elongated and over time when your penis heals from your pe workouts it will take on that elongated state permanently. Think "turtling" = counterproductive and [words=http://www.
phallosan.com/shop/catalog/default.php?z=eNortjIxtVKyL0pNszWxMFcrSSxKTy2JL0hMT7U1UisoykyxtbBQSy4tLsnPjS8uKcrMS7dVsgZcMMpbEbo%2C]ads[/words] = productive.