Intimacy is a process not a thing. It takes place over time and is not stagnant. In fact, any kind of stagnation in a relationship kills intimacy.
Intimacy can also take many forms.
One form of intimacy is cognitive or intellectual intimacy where two people exchange thoughts, share ideas and enjoy similarities and differences between their opinions. If they can do this in an open and comfortable way, then can become quite intimate in an intellectual area. A second form of intimacy is experiential intimacy or intimacy activity. Examples of this would be where people get together to actively involve themselves with each other, probably saying very little to each other, not sharing any thoughts or many feelings, but being involved in mutual activities with one another. Imagine observing two house painters whose brushstrokes seemed to be playing out a duet on the side of the house.