I once had these two friends in high-school. We'll call them Kate and Beck. They were both very much straight (most of their conversations were about the cute boys at our school). They were also very, very good friends who deeply loved each other in a very platonic way.
One day, they joined hands while walking down the hall. From that day on a rumour spread through our school that they were lesbian lovers.
The talk of Frodo and Sam being gay is the same phenomenon. It is a misinterpretation of affection.
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