My understanding is that a number of countries, including Ireland, were holding out for a definition of rape that included all non-consensual sex acts - for instance, the thing Julian Assange was accused of, removing a condom during otherwise consensual sex. Other countries, including France, wanted rape to be only sex obtained by violence.
France is currently revising its own laws and I'm sure there are French Mumsnetters who know far more than I do about this.
Personally, I think putting consent at the centre of the rape definition is a lot better for women than insisting on proof of physical injury, but can see that delaying the harmonisation of the law is disappointing.