Some guys can jelq to over 7" of mid shaft girth. When a woman feels that thickness she can orgasm and powerfully spasm in some cases for several minutes and eventually lose consciousness from the intense pleasure. After this occurs there is a danger of penis captivus, whereas your erect penis is actually stuck inside the cooch and may require third party intervention to be released. I'd try to keep your jelqing of say no more than an 8x6. This is minimally optimum for most of the lpsg members. Good Luck.