attempting a "bait & switch"?
Anchor text might say "Wholesome, nice Family-oriented Web-site" and actually link into a raunchy pay-per-click XXX-porn site vis-a-vis "bait & switch"... -just trying to get my head around why one would need what you are asking for...
You may have a legitimate reason for this... I just can't think of any.
I just read this thread: note the addemdum by felgall which supports my contention: