פירוש על קידושין 42:17

The whole law of the “beautiful woman taken captive” is an unusual law because it allows a Jew to have sex with a non-Jewish woman (one time). So maybe the same rule applies to priests. Alternatively, since priests have extra restrictions, maybe they are prohibited to do what other Israelites are allowed to do.
As we saw in yesterday’s section, Rav allows and Shmuel prohibits.