I think age and confidence are part of positioning choice. When I was younger, I always positioned down, making a nice rounded bulge. Most of the guys on my swim team did the same. If I did get hard, it was not quite as obvious, the bulge just looked bigger. As I got older I shifted to positioning up. I hated the feeling of my penis curving down between my legs, it just feels more comfortable straight upward. If I get hard, I just push sideways as needed.
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