Why is it in the book "trip to Japan" When a female cleaner in Onsen jokingly touched his naked genitals. Why was he pleased?

In the context of a book like "Trip to Japan," the scene where a female cleaner at an onsen playfully touches the main character's genitals may be intended to illustrate cultural differences regarding nudity and intimacy, as well as the humorous or light-hearted aspects of travel experiences. In Japan, onsens (hot springs) are places where nudity is normalized, and interactions can be more relaxed due to cultural attitudes towards bodies and privacy. The scene could be reflecting a playful or flirtatious dynamic that the character finds amusing or enjoyable, contrasting with more conservative cultural norms elsewhere. Ultimately, such interactions can serve to highlight themes of vulnerability, openness to new experiences, and the humor that can arise from cross-cultural encounters. The character's pleasure may stem from a mix of surprise, humor, and the unique cultural setting that fosters a sense of freedom and unexpected connection.