Sex

...

...

Operational details and the historical origins and development of body aesthetics Wakame...

...

...

...

1. Kato Taka's Life and Early Career: Key Milestones Chart 2. Ken Shimizu's Life and Early Career: Key Milestones Chart 3. Genjin Moribayashi's Life and Early Career: Key Milestones Chart 4. Takushi Yoshimura's Life and Early Career: Key Milestones Chart 5. Daisuke Sadamatsu...

Physiological Basis: How Thrust Depth Affects Sexual Pleasure; Vaginal Anatomy and Sensitive Areas; Thrust Depth and Orgasm Mechanisms; Psychological Factors in Intervention; Thrust Depth in Sexual Research; Scientific Evidence: Research and Data Analysis; Practical Skills: Suggestions for Enhancing Pleasure; Basic Techniques: Nine Shallow and One Deep Method; Advanced Method; Partner Communication; Why "S-Shaped Thrusting" Might Be Effective?; Practical Suggestions and Precautions; In research on human sexual behavior, thrust depth...

The basic concepts of S-shaped sexual thrusting, detailed explanation of depth variations, time interval arrangement and control, chart data display, S-shaped vs...

...