Donuts! I see conversation concerning Donuts or how to prevent them. COMPLETELY UNDERSTANDABLE! Let me say this, use a donut on someone and it blows their mind! I was told it's comparable to a baseball going in and out!
My starting unpumped girth is 5" (12.7cm) and I want to focus on hopefully increasing that. So I will change devices, but what size tube should I start with?