To use one or not to use one?

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When do you feel is the appropriate time to start not using protection? I just recently found out that a good friend of mine has been having relations without protection. It is a fairly new relationship, only about a month old -- but the argument is that birth control is involved, so who cares? I personally use both. What are your views on this? When is it "time" to go bare? Or do you feel as though it is only time when you are trying to conceive?