From Your source... it reads...
"both cases began with consensual sexual contact but later included what the women claimed was nonconsensual sex, in which Assange didn’t use a condom"
Non consensual sex is rape. I don't think it is an obscure law in Sweden to have sex without a condom, but is a law that a woman that says no to having sex without a condom is rape.
The point is all the facts, details and context are not being fully reported in the media.
“but is a law that a woman that says no to having sex without a condom is rape.”
so if a woman says no to sex with a condom, that’s not rape?