I think its OK but I if I was wearing a porn sig I think people would take what I have to say even less seriously than they already do... I can imagine it going something along the lines of:
Me: Craig Wright is a fraud. There's no way he's Satoshi, man. How can you guys believe that stuff? Plus that Calvin Ayre guy is pretty creepy.
Them: Yeah well at least we're not advertising porn in our signature space.
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Probably just gonna stick with Bit Blender.
Depends what the money is saying. If its better pay than my current campaign & a trustworthy, legal & legit site then Ill wear any kind of sig/avatar

Im such a slut

Unfortunately, I won't be participating in a porno signature campaign. I just can't bring myself to wear a signature with a picture of some woman with a look of ecstasy on her face and huge hooters. I'm sure most here would feel the same if it had pictures of glistening muscular men.
Edit: Now that I think of it, these signature adds can't contain realistic pictures, right? Maybe this is nothing to be afraid of but to embrace.