I fear to ask, how deep is vaginal tunnel? 99% of the females only have a canal about 6in deep. Cervix average out arond 4.5in in from the labia majora. If you have a girth of 5.5in to 6in, the back point is reduced to 5in deep. My wife bottomed out at less than 5in at 6.3in girth. Of course, there are exceptional size queens.