The point that is being made is that you do new things you haven’t done before. Explore!
For example, If you are a gym rat in the morning you can still do that yourself without the other person and then later in the day do the new things you never done before. The other person benefits as well. You don’t always have to be glued to the hip of the other.
So you argue that you should both enjoy exploring new things together in common.
No one is arguing that you should spend every minute with your partner, but if you want to spend time together, you should have an activity that you both enjoy (which might be exploring new things!), otherwise the relationship will be hard.
on the contrary, most relationships got started only because both partners enjoy exploring each other’s bodies. any other activities they might have in common is some afterthought that is tacked on after the relationship acquired a stable footing. i still don’t have any activity in common with my wife, and we’ve spent 2 decades & change…
For example, If you are a gym rat in the morning you can still do that yourself without the other person and then later in the day do the new things you never done before. The other person benefits as well. You don’t always have to be glued to the hip of the other.