Ah, this is what we need, more sex on the telly. So, are researchers of sexual behaviour pioneers or perverts? An eye-popping history of the men and women behind modern sex research: the scientists who, for more than 100 years, have been peeking beneath the sheets, trying to uncover our deepest secrets. The boffins themselves range from courageous to deeply eccentric and their methods visionary, kinky and sometimes bizarre. But their findings have transformed the way we think of sex, and have changed our lives. The first episode concentrates on theories relating to the differences between men and women, including the work of 1950s gynaecologist Bill Masters and his secretary Virginia Johnson, who wrote a best-selling book after recording 10,000 orgasms in their laboratory. Another hard day at the office.