Men, really is having sex worth it?

Like in celebrity cases, men cheating on their wives with other women run the risk of getting caught. Kobe Bryant just got hit with paternity papers and I was just asking why? His wife is beautiful, why cant he/men be faithful? Is my female perspective blocking my mind on why fidelity is sacred? I know there is women who dont agree with me and men that might, I just want to see if a quick apperance on Maury is worth all that?