It depends on what's in your signature. I use two sites, but I don't think they allow nudity, which I never have so I don't have to worry about it.
You could right click on some of the other people's signatures and check the properties of it to find out the hosting site some of them come from and then check some of them out.
8/10 Love Sandra Shine, love animated sigs/avatars and aint enough out there! But in terms of file size (over 400k)it quite a heavyweight, so you lose marks there.