A better question might be do I want law enforcement angencies dedicating time to investigating adultery and the answer is certainly not. But I don't object to the law being on the books and I wouldn't object to a prosecution if the matters warranted it.
If someone's affairs are causing a huge amount of public turmoil or real harm to bystanders, a prosecution would be a good thing, I think . It would certainly make others inclined to screw around a little more circumspect.
But the purpose of the prosecution would be public order and not saving souls or making someone good.