The overfishing of our oceans is a serious threat to aquatic life. And while curbing our appetite for seafood is one way to help, it’s not the only way. This hour, we’ll talk about how we can encourage the wet and wild ways underwater creatures procreate with marine scientist Marah J. Hardt. She’s the author of “Sex in the Sea: Our Intimate Connection with Kinky Crustaceans, Sex-Changing Fish, Romantic Lobsters and Other Salty Erotica of the Deep” (St. Martin’s Press).