It’s fair to assume that, when it comes to your penis, you already know the basics—what feels good, what changes over time and what signals can tell you something isn’t quite right.
When it comes to knowing about penises, things get a little trickier. We’re constantly bombarded with ideas of what’s "normal"—from size and length to function and circumcision—and, when it comes to talking honestly about what’s between our legs and how it stacks up to other penises, plenty of us struggle.
Fear not: This comprehensive, five-part guide is your handy companion to understanding not only your dick but also others' around the world. From sex and reproduction to health and aging, here’s everything to know.