сэдрэ, /sɛ'drɛ/, n. sex, sexual intercourse, sexual activity

usage: (The word for "sex" meaning "male or female" is крам.) "Have sex" is "do sex" (do = спа); "sex" is accusative, and normally takes an indefinite article, but can take the mass article if used more generically or hypothetically. "Have sex with xyz" requires the comitative suffix кя on xyz; the meaning "have sex with each other" always requires the reciprocal suffix гур, even though English usually leaves "with each other" implied.