同房

tóngfáng
  1. (of a married couple) to have intercourse
  2. (literary) to share the same room
  3. of the same family branch

CEDICT

literary

Entry Composition

1 同 tóng
  1. like
  2. same
  3. similar
  4. together
  5. alike
  6. with
2 房 fáng
  1. house
  2. room
  3. branch of an extended family
  4. classifier for family members (or concubines)

classifier: 間