http://naughtybook.ning.com/ has great groups and active discussions. Amongst many other things. Everything you can think of and room for you to add anything they haven't already.
Has some GREAT erotic pictures.
You can follow my activity on there by clicking on Groups. Then Writer's Corner and you'll see Those Two under the discussions section. Then click on my name. I have posted under various other groups and fantasies. All naughty of course.