I personally do not see what the big ordeal with adult web hosting is. I have been hosted by other web hosting companies in the past that allowed adult content, and I never had any problems. Any web site is subject to hacking attempts I would imagine, regardless of hosted content.
Im guessing that if a web site web master doesnt take proper security measures (regardless of content) they are subject to hacking. I have always used secure measures when connecting to any web site I have designed. (ex: sftp or shh)
Besides, I would guess that any web hosting company that knows what is constantly goin on with their servers, would also catch any attempts of someone trying to hack into someone's web site.
But thats just my 2 cents worth
