The actions of the women do not seem to show rape or any kind of abuse. One woman held a party with him after the encounter and another went out to eat with him.
If the British government had any integrity and sense, it would bind itself in writing to Assange that it would not extradite him to any nation but would simply deal with him legally and fairly concerning his braking bail, nothing more. In fact, it should not seek to punish him but rather consider his time in the embassy as time served were he found guilty of breaking bail. Then it would let him go wherever he would want in terms of other nations.