have a roving eye idiom old-fashioned humorous
色迷迷;总找机会寻花问柳
If you say that someone has a roving eye, you mean that they are always sexually interested in people other than their partner.
By his own admission he had a roving eye and was easily infatuated.
Although he's going out with one of the world's most beautiful women, the actor still has a roving eye.