One possible theme is self - discovery. For example, his first time trying a new sport like surfing. He discovers his physical limits and his ability to overcome fear in the face of big waves. This helps him understand himself better.
Adventure could be another theme. If Kirsten's first time is related to trying a new sport like skydiving or surfing, it's all about the thrill and the new experience.
One possible theme could be self - discovery. People might realize new things about their own boundaries and preferences. Another theme could be relationship building. It could show how a couple's relationship either strengthened or faced new challenges through the swinging experience.
Another theme might be adaptation. Facing a new situation like in this 'pegging first time story', the person has to adapt to new circumstances, new people perhaps, or new ways of doing things. For example, they might need to adapt to a new environment related to the 'pegging' activity. This could involve getting used to different equipment or procedures. It's all about how they handle this newness and change.
One possible theme could be embarrassment. If it's about an unexpected encounter with a bra, it might lead to an embarrassing situation for him.
Change could be a theme as well. The arrival of the first deer in an area might bring changes to the local ecosystem. For example, the deer could start eating certain plants, which then affects the growth of those plants and the animals that depend on them. It could also be about the change in human perception of deer over time, from just a source of food to a symbol of grace and wilderness.
If we consider bareback in the context of horse riding, possible themes could be freedom. Riding without a saddle gives a more direct connection to the horse and a sense of unbridled freedom. Another theme could be courage. It takes courage to ride bareback for the first time as there is less security compared to riding with a saddle.
One possible theme is survival. Tribes often had to face harsh environmental conditions, and stories about how they first managed to find food, water, and shelter would be important.
Growth could be a theme. Since they are about first times, it might show characters growing through new experiences.
One possible theme could be change. Since it's the last first time, something is about to shift or end.
One possible theme could be friendship. If it's their first time doing something together like going on an adventure, it might highlight the bond of friendship between them.