YOU SAID:
he has a girlfriend and they sleep together
INTO JAPANESE
彼にはガールフレンドがいて、一緒に寝ます
BACK INTO ENGLISH
He has a girlfriend and sleeps together
INTO JAPANESE
彼にはガールフレンドがいて、一緒に寝ます
BACK INTO ENGLISH
He has a girlfriend and sleeps together
That didn't even make that much sense in English.