MSF provides housing to the international staff. Men and women are asked to live together, and this naturally leads to a lot of sex among the staff. Alone, this is not a problem, but these relationships often complicate working together and bring additional stress into an already stressful working environment.
Some of the locations where MSF works do not adhere to the same beliefs as the people that MSF sends to work there. International staff have started relationships that are culturally forbidden. This has led to staff being quickly flown out of the country to avoid prosecution, a plethora of uncomfortable situations, and likely unthinkable consequences to local people in the places they work.