In Islam, a woman’s beauty is for her husband, and a man’s eyes are for his wife. This is one reason why women are commanded to cover (wear hijab) and men are commanded to lower their gaze.
A man’s admiration, fantasies, devotion, intimate relationship, and love are for the woman who deserves it: his wife, the woman who has accepted him and shares her life, love, happiness and sadness with him. He should not look at other women in pleasure.
It is the same with women. A woman’s beauty, devotion, intimate relationship, and love are for the man who deserves it: her husband, the man who has accepted her and shares his life, love, happiness and sadness with her. Her beauty is not for any random man to look at for pleasure.