Although it's the 21st century, the prevalence of skewed sexual attitudes and a lack of sexual knowledge is shockingly widespread. Many people don't even understand the basic anatomy of their own bodies, so how can they talk about sexual health, harmony, and satisfaction? Even some sex education or popular science books and manuals suffer from this problem. Some authors themselves don't understand, offering unsolicited advice; others are overly restricted by publishing regulations, suppressing their own thoughts and leaving readers feeling uneasy. Therefore, it's rare to see a complete set of diagrams illustrating male and female reproductive organs, especially frontal views of the male genitalia, even in Western books of this kind. But if you can't even understand these basic facts because you can't find proper illustrations, how can you understand, utilize, and explore the functions of your sexual organs and enjoy sexual pleasure and harmony?
Indeed, if you don't understand your own body, how can you experience and enjoy the pleasure it might bring you? It's like playing the piano: if you can only see the half of the keys that aren't obscured, how can you play a beautiful, complete piece? Although the obscured keys still objectively exist, you don't know them and have no way to play them. Or, if a quarter of the keyboard were permanently missing, although you could still play some pieces, the disjointed or abrupt scales, the original complexity, and the depth of the music wouldn't be reflected. In other words, it would be an incomplete piece, inevitably sounding somewhat awkward.
This problem exists precisely in our 21st-century society. The long-standing and severe lack of sex education (especially for adults) inevitably leads to men and women being unfamiliar with their own and their partner's genitals, thus forming the root cause of sexual disharmony and dissatisfaction. People's language when discussing the body, arousal, and sexual issues is very poor or quite implicit. For example, while women's anatomical structure seems to suggest that their organs are equivalent to men's, in reality, women have far more erogenous zones than men, with greater differences, more hidden locations, and are more taboo to discuss. Many are intentionally omitted, so women have no way of knowing or understanding them, let alone playing with, stimulating, enjoying, or developing their potential, untapped sexual abilities.
