To the shock of no one (via the BBC):  Ex-IMF chief Strauss-Kahn pleads not guilty

The foundation of the case can be found here:

The prosecution says it is confident it has DNA samples which prove the woman’s allegations against Mr Strauss-Kahn.

Strauss-Kahn lawyer Benjamin Brafman insisted last month that any forensic evidence would not be "consistent with a forcible encounter".

The defence is expected to admit a sexual encounter took place, but argue that it was consensual.

It would appear that DSK will not be able to argue, given the DNA evidence, that there was no sexual contact, so this is going to become an argument over consent.