Oxfam did not ban its staff from using prostitutes because it would be "impractical" and infringe their civil liberties.
In the staff training manual published on the charity's website, they say that they would "strongly discourage" that their workers in the field pay for sex, but do not go as far as a total ban.
Oxfam has found itself at the centre of a growing furore after it emerged that an investigation found its aid workers had been using prostitutes, some of whom were allegedly underage, in Haiti, where the practice is illegal.
Since initial allegations emerged whistleblowers have come forward to allege sex for aid and the abuse of young people in charity shops in Britain.