Is 同性恋 considered a slur?
The expression of “同性恋” in Chinese, I think, is too formal and is hardly used in Chinese spoken language. In Chinese slang, some may use "同志"（which originally means comrade or like-minded or congenial people in China）to euphemistically refer to homosexual persons. In reality, influenced by English, we youngsters in China directly use gay or lesbian more frequently, rather than a Chinese word.