Despite also having a "pop-up" blocker I too had a similar problem on the "Female First" site a couple of months back - not naked women (or men....shucks!) but 888 on line casino, it only ever happened on that site and it was always the same pop up ( which neither of us have ever logged on to)...a complete pain in the bum !! In the end it just stopped happening ...not a clue though what caused it in the first place ?