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An uncle of mine once told me that a rabbi told him that having marital relations on Friday nights is a "double mitzvah," presumably because one would be fulfilling both the obligation to have pleasure (oneg shabbat) and the obligation to be fruitful and multiply (piryah verivryah = procreation). Where is the source for considering this a double mitzvah, doing two mitzvot b'vat achat?

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What is a "double mitzvah"? Are you asking whether the act constitutes a fulfillment of pirya v'rivya, whether it fulfills oneg shabas, or whether it is possible to perform two mitzvos with a single act? – WAF Jun 27 '12 at 14:53
But what if a child is created?? We are not allowed to create on Shabbat! – user1937 Sep 27 '12 at 13:32
@Chaya - Some halakhic authorities (Ben Ish Chai, Rav Kook?) forbid saying birkat ha-ilanot on shabbat because it is being boreir the nitzotzot ha-kedoshim. – Adam Mosheh Sep 28 '12 at 2:34
up vote 11 down vote accepted

Shulchan Aruch Orach Chaim 280:1

תשמיש המטה מתענוגי שבת הוא, לפיכך עונת תלמידי חכמים הבריאים מליל שבת לליל שבת.‏
Marital relations are among the delights ("oneg") of Shabbat, and therefore the time for marital relations for a healthy Torah scholar is from Friday night to Friday night. (translation mine)

So the two mitzvot are Oneg Shabat and Onah. If you want to throw in Peru Urvu, all the better!

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