The Coolidge effect is the progressive decline in a male's propensity to mate with the same female combined with a heightened sexual interest in new females.

Experiment showed that lions who had a reduced sexual interest in the lionesses around had a renewed libido when a new lioness is introduced to the pride. Men are always attracted to new pussssy, whether new pusssy is not as good looking as the old.

It's why a man can have a beautiful wife and still sleep with an ugly house girl or side chick.

it's nothing personal it's just biology.