I use Teflon Tape or Plumber's White Tape.
I noticed once when I fitted the Fittings to a "Copper block", when it was tight it didn't leaked @ all(tested for a couple a mins though).
I think it really depends on what material is the tap, something brittle will either crack, loose thread, etc. depending also on how you take care of it.
AFAI noticed some don't use any Tapes @ all. Testing for leaks should be done.
Well for me I want to be sure since I don't test leakage most of the time, takes too long.
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