The flip size is I have been with women with incredable vagina's that grip evry inch of my cock and makes it almost impossible not to come without pausing. I have also been with women with large vagina's that don't even come close to feeling as good. My thinking is the reatshionship between the cock and vagina is key and you just have to find the correct fit.
4 - Use a moisturizer on the penis before the exercises and it is preferred not to use soap and shampoo as these materials will lead to redness and irritation of the penis skin . If it stays for a long period of time, in addition to dry skin, and the occurrence of cracks, it is preferred to use the Intensive Care Vaseline instead of the ordinary Vaseline as it can stay on the skin for long period of time without irritating or damaging the skin of the penis.