Lars has written about his interactions with Linus before in this article: https://liw.fi/linux20/

I fondly remember these lines:

    That summer, I re-connected with my fellow students from the university, 
    including Linus. One of the students a few years older than Linus and me, 
    Patrik, had a sauna in the building he lived, and he booked it once a week 
    for the group of us. You perverts who think the word sauna is a synonym for 
    brothel can stop imagining orgies: in Finland, saunas are for bathing, 
    medication, even meditation, not sex.

    There’s a semi-famous picture of Linus, looking naked, drinking beer. The 
    picture was taken at Patrik’s, by a fellow student, Stina, and Linus is 
    wearing trousers, but it was a hot summer day, so he didn’t have his shirt 
    on. No orgies. Really.