problems with expression lists

I am having a problem with my expression lists. I am trying to block
the search of words so I am using a second expression list to do that
and here it is

(^|[-.?+=_0-9])(orgie|sex)?([-.?+=_0-9]|$)

nothing to fancy. only problem is when someone does a search on
anything it gets blocked because every search has an = sign.

what am I doing wrong with this expression. I have since disabled it
and am only doing words for expressions, like (orgie|sex) only problem
there is that sites that have those words are blocked, like
www.demsextrememakeover.com which has nothing to do with sex but its
blocked because of the word sex.

Thanks for any help