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Don't call groups of people ‘guys’. Don’t call women ‘girls’.
Avoid gendered terms in favor of neutral alternatives, like ‘server’ instead of ‘waitress’ and ‘businessperson’ instead of ‘businessman’.
It’s OK to use ‘they’ as a singular pronoun.
Use the following words as modifiers, but never as nouns:
lesbian
gay
bisexual
transgender (never ‘transgendered’)
trans
queer
LGBT
Don't use these words in reference to LGBT people or communities:
homosexual
lifestyle
preference
Don't use ‘same-sex’ marriage, unless the distinction is relevant to what you’re writing. (Avoid ‘gay marriage’.) Otherwise, it’s just ‘marriage’.