性交せいこう Common Noun Irregular Intransitive English jmdict 1 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru intransitive verb sexual intercourse;sex;coitus 性交の最中彼女はつまらなそうな顔をしていた。 She looked bored while we were making love.
膣性交ちつせいこう Noun English jmdict 1 noun (common) (futsuumeishi) vaginal intercourse;vaginal sex Other forms 腟性交 【ちつせいこう】 (search-only kanji form)