Why is Proust's narrator so obsessed with lesbians?

Am still making my way through In Search of Lost Time. I had intended to finish in a month, but it has not been a month, it's been two months, and I'm still only on the fifth volume. Which is by far the dullest of the volumes. I'd forgotten how little I am interested in the story of Marcel's love affair with Albertine. In the earlier volumes in which it…