If you want to know the to witness courtship behaviors

Another endearing tale is that of , a Japanese macaque monkey who fell in love with a female monkey named Akari . Their whirlwind romance began when Kaito, then just a juvenile, would often sneak glances at Akari through the enclosure's bars. As they grew older, their friendship blossomed into a romance, with Kaito showering Akari with affectionate gestures and gifts.

The unwritten rule: – after the confession of feelings but before the “official” couple status. It’s a pressure-release valve.