Another irritating but sincere question. I had a Zchus of serving a great Rabbi Z"l here in Jerusalem who wrote lots of books on Torah as well as on Halacha and Shu"t. I helped him publishing his books for a decade and for his last years I was driving him to various medical procedures out of town...

So says the Gemara in Masechta Sanhedrin, 39a: “Caesar said to R' Tanchum, 'Come, let us all become one nation.' Rabbi Tanchum said: 'Very well. But we, who are circumcised, cannot become uncircumcised as you are; you all circumcise yourselves and become like us.'” The Midrash, in Yalkut Shimon...

The gemara (Ketubot 4a) and poskim (Shulchan Aruch, Yoreh Deah 193:1) refer to the first time a couple having marital relations as "beilas mitzvah" (mitzvah of marital relations). Being as the couple is obviously not being mekadesh via this biah (see Yevamos 52a, and Rambam, Hilchos Issurei Bia...