No good. The spammers would just start using variants of phrases like "s.e.x.u.a.l.l.y explicit" and so on.
These anti-spam laws are a waste. 90% of all spam comes from overseas. You think those spammers are worried? Got news for ya...
Beyond that, most of the spam I get now has nothing to do with porn. It's all about low interest loans, vicodin or some other garbage.
Do what I do: I have a rule that throws everything into the junk folder unless the sender is known to be legit.
My spam filter catches virtually all the spam. Unfortunately it occasionally catches a real message from someone I haven't yet whitelisted, so I don't like to delete from the server. But it's helpful to throw the spam into my Deleted folder where I can give it a quick lookover and then delete it automatically when I close the program.
They already are, to dodge existing spam filters. I'm getting tired of getting emails for "wh0les:ale v1agra" or having the p3n1s enlarger folks after me.