As is the case with every other part of the internet - you should probably use noscript if you are concerned about being attacked. You will never be completely safe from exploits - you need to get comfortable with that. To your browser, it's exactly the same as the rest of the WWW.

Due to the bandwidth issues, most sites are not going to serve images unless they are a media site of some sort. If you don't want to see animal porn on the WWW, how on earth do you keep your virgin eyes safe? You don't seek it out.