Ok, it seems they have banned Renderosity links from accessing their site:

Quote - Hello, I'm the "403 Forbidden" error page of Posetteforever. You're here because you should not be here. The most common reasons of the appearing of this page is that you're directly coming from a link from a site that we consider "hostile" , like Renderosity (ask Karen Janes why...) . In this case, you can simply click the "go to" button of your browser or type the address manually: the page and the site will appear normally. We block referrers from that kind of sites as a part of our policy and don't want to be connected to them in any given way. Another reason could be that your IP address comes from a range of addresses that spammers or harvesters commonly uses, we have a system that takes directly control of them but sometimes we have just to ban a whole IP range. We use also to ban IP ranges that come from services that lurkes the site in a strange and aggressive way, for example, most of them come from China, while a Chinese couldn't probably reach the site anyway. Maybe you reach this page because you're David Hoadley. Sorry we don't like your sick porn crap, "man", rofl. If you think that we're wrong with your IP address send an email to posetteforever@spamcop.net , We'll check it as soon as possible and tell you the reason why. Fell free to send spam there, it's an address created to report spammers. You can even try to circumvent the barbed wire with a proxy or an anonymizer... Just try. Take care. Tormie & Posy and the Staff of Posetteforever

Personally I think that message is way too "high school" :rolleyes:

If you still want to go there, just paste their address to the address bar and go there that way.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi