Playlist

Sex: Can we talk?

A few things you've always wanted to know about sex: why we enjoy it, how to explain it, and, importantly, how flowers do it.

Mary Roach

10 things you didn't know about orgasm

Esther Perel

The secret to desire in a long-term relationship

Julia Sweeney

It's time for "The Talk"

Helen Fisher

Why we love, why we cheat

Amy Lockwood

Selling condoms in the Congo

Elizabeth Pisani

Sex, drugs and HIV -- let's get rational

Hans Rosling

Religions and babies

Jonathan Drori

The beautiful tricks of flowers

Shereen El Feki

A little-told tale of sex and sensuality