פירוש על קידושין 42:20

According to this version of the dispute, the two sages both agree that marrying her, the “second intercourse” is prohibited because priests may not marry converts. They disagree over whether the Torah’s concession to the evil inclination applies to even to the priest. Rav says that it does, since priests, like everyone else, have evil inclinations.
Shmuel holds that since he cannot “bring her into his house” as a wife, he also cannot have intercourse with her the first time.