The image host called MicroTech (here
) is experiencing hosting problems right now.
The effect of these problems is that if I host image X (call it 1.jpg) people might see Y (2.jpg) - and Y might be porn, even though I linked to X and not Y.
That affected my sig until I took my sig down and rehosted it at Photobucket.
Iplaybass is having that problem too, because his sig is hosted at microtech.
I got an email from the owner of Microtech about 2 weeks ago describing this problem - and apparently it is not fixed.
So, if you see porn in anyone's sig or avatar or posted iamges, right click the image and check the URL - if it is MicroTech then the person who posted it is unaware, and did not actually post porn ... the fault lies in the image host.