Tim Challies recommends Sexual Morality in a Christless World by Matthew Rueger. This book gives the history of sexual mores among ancient Romans and Jews, showing that the sexual revolution we are headed into is not new. This isn't exactly comforting, though. Things will likely get worse in the short term, and Christians will suffer more persecution for holding up the biblical standard of sexual ethics.
Erik Raymond is good, on duty and delight.
"Many people avoid their duty because it is not their delight."
"I am advocating for doing the right thing—that which God calls us to do—whether we feel like it or not."
"Don’t be scared off by such rigid words as duty. The Legalism Police will attempt to cite you with some type of holiness violation. But friends, when the duties are ordained means by God, they are blessings filled with the seeds of your delight."
Kevin DeYoung has the right perspective on this election season, including a great response to the old saw, "We're not electing a Pastor-in-Chief!"