1 Corinthians 7:1-9 (NASB):
Now concerning the things about which you wrote, it is good for a man not to touch a woman. 2 But because of sexual immoralities, each man is to have his own wife, and each woman is to have her own husband. 3 The husband must fulfill his duty to his wife, and likewise the wife also to her husband. 4 The wife does not have authority over her own body, but the husband does; and likewise the husband also does not have authority over his own body, but the wife does. 5 Stop depriving one another, except by agreement for a time so that you may devote yourselves to prayer, and come together again so that Satan will not tempt you because of your lack of self-control. 6 But this I say by way of concession, not of command. 7 Yet I wish that all men were even as I myself am. However, each has his own gift from God, one in this way, and another in that.
8 But I say to the unmarried and to widows that it is good for them if they remain even as I. 9 But if they do not have self-control, let them marry; for it is better to marry than to burn with passion.
Nothing in this passage mentions reproduction / the begetting of children as the primary motivation/reason for initiating intercourse (at least at face value). Instead, we see expressions such as "fulfill his/her duty to his/her wife/husband", "stop depriving one another", "come together so that Satan will not tempt you", "lack of self-control", "for it is better to marry than to burn with passion", which can more easily be understood in my opinion as Paul saying "look, if you need to keep your passion in check, get married and quench it with your spouse". Instead, nothing in the passage makes me think that Paul's intention was to say "look, if you really want to have many children, get married and beget lots of them with your spouse". The latter reading would make no sense to me.
Question: Is Paul expressing approval of marital intercourse as a means to keep the sexual passion of the spouses in check rather than beget more children at 1 Corinthians 7:1-9?