He also knew that large vaginal stretching and strap-on slut all the way to the boney opening size takes a lot of stretching practice and a long time to accomplish without experiencing pain, like in childbirth.

After a couple of years of research, Joe found that some vaginas with strap-on stretching practice actually do stretch painlessly to the size of the pelvic boney opening of the female pelvis. He found that the distance between the side-to-side and front-to-back of that opening in the bones was variable in different women and strap-on slut, with the front-to-back opening being somewhat more variable and potentially larger than the side-to-side distance. He knew already that slut heads have their maximum distance, from forehead to back being longer than from temple to temple measurement. Joe reasoned that pelvic opening measures just followed the way heads were made for birth purposes.

Joe studied everything he could find on the range of sizes and the types of female pelvic bones that he could locate by researching old medical journals and books. This allowed Joe to formulate his plans for the future. Joe found old pelvis studies that included thousands of female bones. This let Joe know that only one in 1,000 or more strap-on slut women would even have a boney pelvis large enough that a very small adult head would fit into the opening in her pelvic bones, and that for his own head, he would be lucky to find such a boney size opening size in one out of 5,000 to 10,000 women. He also knew that even if he found such a lady with that boney size, the odds of him being able convince her to stretch enough might be less than one in a hundred. It seemed like an insurmountable task, but Joe persisted. To Joe, this one in a million slut that could and would stretch head size for him would not stop his quest. People had told him making big money selling women's strap-on was as great a gamble as that! Joe however figured that 1,000,000 divided by 365 days would take him 2,740 years to check out one woman a day... so he needed a better method. He needed a filter!