What size is perfect for a chastity tube? 1- So long that some or full erection is possible? 2- So small that erection is impossible? 3- So small as your penis smallest size when cold water or ice has shrink it? My first chastity tube had size 1 but today i only use size 2 and my experience is that the body very fast accepts that there is no idea to try to get any erection. Also at the night and early morning. Today I only use chastity-tube with total length 70 mm/2,4 (Steelworxx Revenge and Looker) and it works good for me. Thinking to try a smaller (size 3) It should be very interesting to hear about other experience what is the perfect size?