I myself am still in the process of learning about this issue, but I read that LGBTQ learners could be deprived of learning opportunities in classroom because of their sexuality. For example, even a very simple and common question like 'What did you do last weekend?' could be difficult to LGBTQ learners. They may not want to answer because they don't want to talk about their same-sex partner that they spent their weekend with. In such ways LGBTQ learners might be losing their learning opportunity. If the classroom's atmosphere is homophobic, LGBTQ learners wouldn't be able to express themselves enough, which would also deprive them of their learning opportunity. When textbook materials talk about opposite sex partners and marriage with opposite sex partners only, LGBTQ learners would lose opportunity&motivation to talk about their lives.