Sidur of Yaakov Emden. The idea was sex that can result in conception should be only Friday night after the middle of the night.

I was thinking of mentioning something about the Sidur of Yaakov Emden.
This was given to me by Reb Shelomo Friefeld. It had a whole section in it about marriage which I could not even read at the time. But before I was married I did study that section. And today it seems to me to be  a good thing to give to yeshiva students before they get married.

You want a shiduch with me? Then learn all of Rav Shach's Avi Ezri, and then call me.