A trademark is only good for a particular industry. For example, Scott Paper Towels can't keep someone from using the name Scott Apple Pies. There is no source of confusion.
Don't distance yourself from porn, it'll be your strongest defense.
If they claim that they are not in the porn business and never plan to be ,then that leaves their trademark open for you to use in the porn biz.
As always, this is just my two cents and not legal advice. Consult your lawyer.
