Save ""Be fruitful, and multiply" - until when?
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"Be fruitful, and multiply" - until when?

(כז) וַיִּבְרָ֨א אֱלֹהִ֤ים ׀ אֶת־הָֽאָדָם֙ בְּצַלְמ֔וֹ בְּצֶ֥לֶם אֱלֹהִ֖ים בָּרָ֣א אֹת֑וֹ זָכָ֥ר וּנְקֵבָ֖ה בָּרָ֥א אֹתָֽם׃ (כח) וַיְבָ֣רֶךְ אֹתָם֮ אֱלֹהִים֒ וַיֹּ֨אמֶר לָהֶ֜ם אֱלֹהִ֗ים פְּר֥וּ וּרְב֛וּ וּמִלְא֥וּ אֶת־הָאָ֖רֶץ וְכִבְשֻׁ֑הָ וּרְד֞וּ בִּדְגַ֤ת הַיָּם֙ וּבְע֣וֹף הַשָּׁמַ֔יִם וּבְכָל־חַיָּ֖ה הָֽרֹמֶ֥שֶׂת עַל־הָאָֽרֶץ׃

(27) And God created man in His own image, in the image of God created He him; male and female created He them. (28) And God blessed them; and God said unto them: ‘Be fruitful, and multiply, and replenish the earth, and subdue it; and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that creepeth upon the earth.’

(נ) וּלְיוֹסֵ֤ף יֻלַּד֙ שְׁנֵ֣י בָנִ֔ים בְּטֶ֥רֶם תָּב֖וֹא שְׁנַ֣ת הָרָעָ֑ב...

(50) And unto Joseph were born two sons before the year of famine came...

בטרם תבא שנת הרעב מִכַּאן שֶׁאָדָם אָסוּר לְשַׁמֵּשׁ מִטָּתוֹ בִּשְׁנֵי רְעָבוֹן (תענית י"א):

בטרם תבא שנת הרעב BEFORE THE YEAR OF FAMINE CAME — from here we learn that a man must practise continence during times of famine (cf. Taanit 11a).

(יב) אָסוּר לְשַׁמֵּשׁ מִטָּתוֹ בִּשְׁנֵי רְעָבוֹן, אֶלָּא לַחֲשׂוּכֵי בָּנִים, (פי' מִי שֶׁאֵין לוֹ בָּנִים). הַגָּה: וְע''ל סי' תקע''ד ס''ד; וְהוּא הַדִּין בִּשְׁאָר צָרוֹת, שֶׁהֵם כִּרְעָבוֹן (יְרוּשַׁלְמִי דְּתַעֲנִית).

...One must practise continence during times of famine, unless he is childless...

Is this a practical instruction? What questions or definitions do we need to make in order to practice this Halacha?