2 sentences for 勾搭 (gōu​da — fool around)

1. 他背着妻子在外面和人勾搭。

   tā bèi zhe qī​zi zài wài​miàn hé rén gōu​da.

   He was cheating on his wife and carrying on with someone else.

   Source: Dong Chinese Dictionary

2. 他们二人私通，勾搭成奸，被众人撞见了。

   tā​men èr rén sī​tōng, gōu​da chéng jiān, bèi zhòng​rén zhuàng​jiàn le.

   The two of them had an affair and were caught in the act of adultery.

   Source: Dong Chinese Dictionary