Sows are usually kept in pigsty to give birth. It's rare to see it outside, and it's even harder to see it in trees. So it is rare for sows to climb trees.

Sows climb trees. Sows are animals without tree climbing skills, so this sentence is generally used by women to describe boys as unreliable and untrustworthy.

Related content explanation:

Two-part allegorical saying is composed of two parts: the former part acts as an introduction, like a riddle, and the latter part acts as a background, like a riddle, which is very natural and appropriate. In a certain language environment, you can understand and guess the original intention by saying the first half sentence and "resting" the second half sentence, so it is called two-part allegorical saying.

China has a long history of civilization. Five thousand years of historical vicissitudes have precipitated, refined and condensed into a wonderful language art, in which two-part allegorical sayings have their unique expressive force. Give people profound thinking and enlightenment, spread through the ages. It reflects the unique customs, traditions and national culture of the Chinese nation, tastes life, understands philosophy and improves wisdom. Two-part allegorical sayings are generally profound, and a short sentence condenses a lot of wisdom.