The Hitchhiker's Guide to Pornography

The universe of pornography has expanded so fast and become so vast, akin to a Big Bang Theory. As such, there's a need for a comprehensive compendium on it, narrated in the voice of Stephen Fry.

The GUIDE shall be crowd-sourced and catalog all forms of porn, serving as a navigational aid to travelers to keep them from getting lost in the bewildering vastness of the porniverse.

Also included is the companion guide, THE HITCHHIKER'S GUIDE TO UROLOGY/GYNAECOLOGY which is similarly replete with all sorts of interesting and not-so-well-known facts, not only FYI's but also TMI's.

For Example:

FYI, the BiG-BLADDER BEAST OF TRAAL normally spends the entire year in uninterrupted sleep, only having to get up once annually to relieve itself. Even then, it typically stubs its toe on the way to the bathroom, muttering about the need to get that light-bulb fixed. The rest of the planet's inhabitants have built their entire civilization around this, using it to forecast whether there'll be another 6 months of rainy season. Indeed, it has become the sacred duty of the Custodians of the Holy Light Bulb to ensure that it remains out on the expected annual date, even while keeping it lit for the rest of the year (the latter being a necessity, to ward off a more infamous and beastlier cousin, which would make short work of them. But that's covered separately in yet another guide.)

FYI, the ultimate answer to life, the universe, and everything is 34.