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?
- Anybody can ask a question
- Anybody can answer
- The best answers are voted up and rise to the top
So the two mitzvot are Oneg Shabat and Onah. If you want to throw in Peru Urvu, all the better!