Most market "super deep anal dildo", generally taken two ways to design appearance. First, vulgar bionic design; second, without considering ergonomics, to design and design. We are at the beginning of "super deep anal dildo" design, the goal is to not only beautiful but also ensure ergonomic strike a balance, and strive to achieve practical, engaging and attracting users are willing to effect long-term use. To this end, we have a team of designers six different styles of design, and each program has produced dozens of prototypes. After numerous discussions and user interviews, and ultimately selected this industry had never uses "super deep anal dildo" vertical line selection spiral design.