Japanese idiom for "don’t get your meat where you get your bread"?


There is an idiomatic expression in Portuguese:

> _Onde se ganha o pão não se come a carne_

Literally, it would translate to _"where one earns their bread one does not
eat the meat"_ and it relates to a common sense advice against trying to
woo/seduce/conquer someone whom one meets on a very frequent basis (esp. at
the workplace). The closest English
[equivalent](https://english.stackexchange.com/a/284673/289673) seems to be
_"don’t get your meat where you get your bread"_.

Is there an equivalent idiom or perhaps _yojijukugo_ in Japanese for this?




Unfortunately, there is no such expression in Japanese that I could think of.
(Or am I the only native speaker who does not know of one?)

The saying would work only in the languages where the colloquial/slang words
for both "flesh" and "income" belong in the same group (as in English where
those are both food items).

I also highly doubt that there is a 四字熟語{よじじゅくご} for the same or similar
meaning. If there were one, a Chinese-speaker here would have posted an answer
long ago.

If I were to **_create_** one for fun, however, I could come up with:

「社恋禁止{しゃれんきんし}」 meaning literally "Office romance prohibited".




Unfortunately, there is no such expression in Japanese that I could think of.
(Or am I the only native speaker who does not know of one?)

The saying would work only in the languages where the colloquial/slang words
for both "flesh" and "income" belong in the same group (as in English where
those are both food items).

I also highly doubt that there is a 四字熟語{よじじゅくご} for the same or similar
meaning. If there were one, a Chinese-speaker here would have posted an answer
long ago.

If I were to **_create_** one for fun, however, I could come up with:

「社恋禁止{しゃれんきんし}」 meaning literally "Office romance prohibited".

