Eddy
10
The site is infected with malware.
It really is a very bad idea to add it to the exclusion list.
http://zulu.zscaler.com/submission/show/20b8eea63e80cf98e39ebfdf914a5103-1400236947
http://urlquery.net/report.php?id=1400237035382
http://dnscheck.pingdom.com/?domain=www.teens-xxx.net
They are using a really obsolete version of vBulletin (2 years old)
That is what likely causes the infection.
Adding that site to the inclusion list is the same as asking “Hé please infect my system and make sure I can’t use it anymore”