Stop-loss is a popular tool in the Forex trading community and you can possibly trade profitably without it. But, while the decision is entirely up to you, I don't recommend Forex trading without stop-loss.
My stops are based only on the charts - not on a defined $ or %. I size the position so that I am not risking more then 1% max on any given trade. I never look at a live profit/loss window which goes hand in hand with using a set $ stop. This keeps my own perceived pain threshold from influencing my trades.