No, the Bible does not anywhere suggest that lustful thoughts toward another man's wife deserves stoning. Jesus said, correctly, that sin doesn't come from external issues but form out of the heart. Same with the sin of homosexuality.
But you can only be judged by what you do, not by what you think. So a man who has sexual thoughts about other men is not gay. Only a man who has sex with other men is gay. In the same way, a man who dreams about robbing a bank is not a theif, only a man who robs a bank.
Both men should look at why they desire something evil. But neither is actionable by law.
Shalom.
Well, you and I will have to disagree on this. Maybe you should ask around, find out how many of your straight male friends fantasize about sex with men. Get back to me.