In Ko Un's short poem “In the very middle of the road”, why does the narrator take a different path?

Question

There's a short poem by Ko Un that, when translated, goes like this:

In the very middle of the road
two dogs are coupling

I take another route

(source; translated by Brother Anthony of Taizé)

Why does the narrator take a different path? Are they repulsed by the sight, don't want to interrupt, or what? How can this be interpreted?