Rashi on Leviticus 14:8/רש"י על ויקרא י״ד:ח׳

1וישב מחוץ לאהלו AND HE SHALL ABIDE OUTSIDE HIS TENT — This informs us that matrimonial intercourse is forbidden to him (מחוץ לאהלו implies outside his home — his family life; cf. Deuteronomy 5:27: שובו לכם לאהליכם) (Sifra, Metzora, Section 2 11).