"She mentioned 'Magnus' -- who, according to her description, was a nerdy computer programmer her own age who treated her like a gentleman should, took her to the cinema, and sometimes shared her bed."
-pg 220

This idea of Magnus is quite interesting to me, since Salander makes up this character in front of Bjurman.  First, Magnus is a male name, and I can't help but draw parallels with the "magnum" condoms when I hear his name.  Salander sleeps with both men and women in this book, so her bisexuality becomes relevant here.  My curiosity begs the question: Why a man?  Why did she pick a male character to represent her sex life?  It may be that she doesn't want to come out to Bjurman as bisexual, although I don't think Salander would really care about that topic; she seems pretty emotionless/careless.  It is also possible that if Bjurman were to know of her bisexuality, he would more strongly believe that she was misguided, troublesome, and unnatural, and Salander has had enough with being looked down upon.

M'lady.

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^ That's Magnus.