He’s not charged with sex offences in the US.
He’s charged in Sweden.
He faces rape and sexual assault charges, which if convicted....you’d figure he does around two to three years in a Swedish prison (figure a South Carolina Motel-6 environment). He does have to worry because he probably won’t have around-the-clock availability of the internet, and he will be forced into rape counseling classes.
Added to this whole mess...at least a quarter of the people within the Wiki-circle....would prefer that he not stay as the boss of Wiki-Leaks. They see this prison episode as a chance to push him out of the organization and retake it with a neutral source. Assange has built an empire and prefers for it to stay within his hands.
I think as each month goes by with Julian in this Ecuadorian embassy deal....he gets deeper into some mental issues. Even if the UK eventually agrees....Julian can never travel to any European country ever again. Even half of the South American countries will admit that they will honor the Swedish request to export him back to face charges. If you ask me....he’s pretty much screwed up his future no matter what happens now.