性せい行こう為いTop 20000MeaningsNoun1. sexual act; sexual intercourseKanji used性nature (of a person)行go為for the sake ofPitch accentせいこういComposed of性せい行こうcharacter and conductNoun為いsecond string of a koto (counting from the player's near side)NounUsed in vocabulary性せい行こう為い感かん染せん症しょうsexually transmitted disease; sexually transmitted infection; STD; STINounExamples1梅ばい毒どくは性せい行こう為いを通つうじて感かん染せんする病びょう気きです。Syphilis is an infection that can be transmitted through sexual intercourse.