The article that smeth posted last week revealed a little more detail about the rape charges. They primarily extend from an encounter with a woman that weekend with whom he was having sex without a condom. She claims that she asked him to stop when she realized he wasn't wearing one and he didn't...or something. It's not clear.
The incident with the broken condom occurred with another woman and an acquaintance of the woman above. After that weekend, the 'no condom' woman decided to go to the police and the 'broken condom' woman went with her to lend support, not intending to press charges but related her story and, it's unclear how, ended up pressing charges as well.
It's all very puzzling and confusing. But not quite as simple as 'his condom broke.'
One thing it is safe to conclude, Mssr. Assange likes to get biz-ay with the lay-lay.