By some method I seem to have saved my single player female elf to my multiplayer character collection. Perhaps it happened when she finished the Arcanum module? In any case, she seems to have lost her female +1 Constitution and -1 Strength, which is so sad, because now she only heals 1 point of fatigue every 10 seconds. I guess it doesn't really matter, but is this a known bug?
If you press x (I believe) while viewing the character screen, you export your character to multiplayer. As for you losing your gender related advantage and disadvantage, I have no idea.