You've gotten a little lost. Adventure is not just a synonym for "something fun to do". Sex, in the most vanilla sense of the word, isn't an adventure. It's not particularly risky, and it's not novel at all. Holding a baby is not an adventure at all.
The "global novelty" aspect of adventure (aside from the "personal novelty") comes from the fact that you're entering the unknown. The adventurous nature of an activity is diminished if it's already common knowledge what you can expect from the experience.
The "global novelty" aspect of adventure (aside from the "personal novelty") comes from the fact that you're entering the unknown. The adventurous nature of an activity is diminished if it's already common knowledge what you can expect from the experience.