I am sure this is but another dirty trick of the evil US security services as it is simply inconceivable to me that someone of Mr. Assange's stature (I anticipate he will join the pantheon of other Nobel Peace Prize recipients such as OUR ESTEEMED RULER, Savio(u)r of our planet AlGore and the ever lovable but thankfully late Yassir Arafat) could do anything other than "things for our greater good."
And it is telling to see how many apparently seriously jump to that conclusion instead of even thinking to take the accusation at face value (at least for the time being). One could say their own bias is showing the least little bit.
Quite amazing when one considers that even anti-Western human rights groups (rather than just the ever evil and roguish US) have expressed grave concerns over the irresponsible release (but it is of course perfectly all right since after all it is done for our greater good)of classified information.
Depending on whether or not the accusations are of a recent assault, Assange may have thought, "I can help myself here, I'm wonderful and I'm Saving the World and anyway, if she goes to the coppers I can just say the evil Yanks are fitting me up."