juggers is right. plus, physical activity prompts sympathetic neural activity, while dilation of the penile arteries is prompted by parasympathetic neural activity; these two mechanisms are antagonistic. So there is really no way to prevent the turtle effect--it happens to me and I'm sure it happens to all of us. Fortunately, it shouldnt have an effect on Penis Enlargement so long as it only lasts 30-60 minutes or abouts. You can counter it by applying a hotwrap shortly after working out and/or taking a warm shower.