It is suggested in the short story "Coming Of Age in Karhide" (added to the 2009 edition of The Left Hand of Darkness as an appendix) that on coming of age, if trapped alone with someone who is in somer (non-kemmer), the one in kemmer would need to satisfy that phase and might try to do that with the person in somer, against their will:
We exchanged and compared symptoms for a mile or so. It was a relief to talk about it, to find company in misery, but it was also frightening to hear our misery confirmed by the other. Sether burst out, "I'll tell you what I hate, what I reallyhate about it—it's dehumanizing. To get jerked around like that by your own body, to lose control, I can't stand the idea. Of being just a sex machine. And everybody just turns into something to have sex with. You know that people in kemmer go crazy and die if there isn't anybody else in kemmer? That they'll even attack people in somer? Their own mothers?" "They can't," I said, shocked. "Yes they can. Tharry told me. This truck driver up in the High Kargav went into kemmer as a male while their caravan was stuck in the snow, and he was big and strong, and he went crazy and he, he did it to his cab-mate, and his cab-mate was in somer and got hurt, really hurt, trying to fight him off. And then the driver came out of kemmer and committed suicide."
The stories told about this happening suggest that the one in somer would be physically hurt by this act. Does this imply that the "default" gender assumed by the one in kemmer in such a situation would be male, as how else could the other be hurt?