Even Detailing World has a "Gentlemans Club" thing for more adult humour, you're allowed into it by request, providing you meet certain post/length of forum membership requirements.
To those who think it's going to be a **** room or something like that, it doesn't have to be anything of the sort and would still need moderating in the same way as Off Topic or General Chat. Perhaps you should take a look at yourselves if thats the first thing that comes into your mind.. As said, there's billions of pages of that material that can be found anywhere else on the net, not here!
The recent thread about some guy from Corsasport.com, that IMO would be a prime candidate for an Adult section, rather than just being censored in the General Off Topic forum. Just to add, I can fully understand why it was censored in that area, as anyone can access it and may be offended by it