Lust not in your heart after her beauty, let her not captivate you with her glance! For the price of a loose woman may be scarcely a loaf of bread, But if she is married, she is a trap for your precious life. Can a man take fire to his bosom, and his garments not burned? Or can a man walk on live coals, and his feet not be scorched? So with him who goes in to his neighbor's wife-- none who touches her shall go unpunished. (Proverbs 6:25-29)
I almost didn't post this proverb. Like some of the other recent ones it's not exactly cheerful and uplifting; besides who wants to think about adultery and stuff like that. But I'm posting these in order - so there it is - and also, just because we don't like to think about something doesn't make the problem imaginary. Real people struggle with things like this all the time. I guess it doesn't hurt to look and see what God has to say on the subject.