BS. It IS a library’s responsibility. They are serving the public, and as such servants, MAY NOT contribute to the delinquency of a minor, nor may they engage in distributing pornographic materials to minors.
Mind your own business. Just because you are a facist, nazi, homophobe does not give you the right to censor these wonderful books.
Besides, children should be able to decide their sexual identity without having it forced upon them by their parents, society, church teachings and nature. How can a child make an educated decision about their sexual orientation unless they are exposed to how joyful gay sex is?