Devarim 23:10 - "And you shall guard from every evil thing". Is this an issur against hirhurim raim? I know there is an opinion in the gemara that says so (Kesubos 46a). But is this issur codified in any halachic literature? Thanks for the help.

Shulchan Aruch ; Even Haezer ; siman 23, seif 3.
Rambam; Isurie biah; 23, 5 &21.

Thanks again. I found your citation in Shulchan Aruch but I couldn't find the one in Mishneh Torah.

When I looked at the place you cited in Shulchan Aruch in the same siman but in seif 5 it says the following. What does this mean (what's in the parenthesis)? Please respond in ivris or PM me. 

אשה שיש לה אוטם ברחם ועי"כ כשבעלה משמש עמה זורה מבחוץ אסור (אבל מותר לשמש עם קטנה ואיילונית הואיל ומשמש כדרך הארץ) תוספות ומרדכי פ"ק דיבמות ונ"י פ' הבא על יבמתו:

Hey there! It's a discussion about a husband having relations with a wife who cannot become pregnant. If it is considered zera livatala. An "eilenis" is a woman who will never reach puberty and a "ketana" is a girl too young to be impregnated. If one is married to either one of these woman even though the sperm will inevitably go to waste nevertheless since it is the "derech haaretz" i.e. it is a normal way of having relations with a wife it is permitted. In contrast to the first case where I believe there is a blockage not allowing the sperm to reach the proper place where that is not a normal way it is forbidden. 

kadeshli wrote on 11 Aug 2020 15:04:

In the Rambam it isn't straight out but he forbids certain things due to a chance of it causing hirhurim. We see an issur from there.

Here seems to the place for all theoretical discussions. 

Heres another 
boca19 wrote on 05 Dec 2023 18:31:

This is 99% incorrect.

I am being generous in my reply 
I may be off by 1