Introducing Mr. 80 Percent, a new six-part narrative podcast hosted by friend-of-Love-Letters Mark Shanahan. Mr. 80 Percent is a deeply personal, sometimes harrowing, often funny, always true story about Mark’s odyssey with prostate cancer. There’s sex, celebrity cameos, real talk about masculinity, and more sex. Listen to Mr. 80 Percent wherever you get your podcasts, or online at bostonglobe.com/prostate.