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I had asked what is the source for the segulah of having relations twice in order to have a boy. I first asked this in order to obtain a source to better ask this question.

The Gemorah says in Niddah 31b הרוצה לעשות כל בניו זכרים יבעול וישנה – One who wants to make all his children males should cohabit once and then repeat it.

In the answer to my question, Michoel so nicely brought the following explanation,

Rashi there explains that this comes in continuation to the previous statement in the Gemora that if the wife emits seed first the child conceived will be a male. By first arousing his wife's desire in the initial act, she will emit seed first the second time.

Howevver the Gemorah in Pesachim Daf 109b says ולא יעשה צרכיו תרי That a person shouldn't have relations twice as it is a problem of "zugos". Doing something in "pairs" could lead to some sort of sacana (danger).

Is there a stira between the 2 gemorahs? If so how can it be resolved?

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Yehoshua
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  • Do it a third time? Maybe it's someone who doesn't worry about zugos. – Michoel Mar 17 '13 at 22:32
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    See what Abaye says at the top of the next daf; the B'raisa mean that one should not engage in relations immediately after eating or drinking in pairs. – Fred Mar 17 '13 at 22:35
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    @Fred sounds like an answer and seemingly takes care of my question! – Yehoshua Mar 17 '13 at 22:37
  • Rabbi Google has a few answers to this – Michoel Mar 17 '13 at 22:49
  • @Michoel Looks like a good question after all! – Yehoshua Mar 18 '13 at 09:24
  • I didn't post any of those results as an answer because after @Fred's comment I don't really understand their question. – Michoel Mar 18 '13 at 09:26
  • @Michoel I understand. Perhaps not a good question but at least those who also thought to ask it. Even in light of what the gemroah says on the next amud! – Yehoshua Mar 18 '13 at 09:29
  • @Yehoshua It should go without saying that our medical knowledge of what causes a person to have a son or a daughter doesn't exactly support Rashi's theory. (It has to do with whether the sperm that fertilizes the egg has an x chromosome or a y chromosome, nothing to do with when the wife "emits seed".) I hope you don't expect putting such segulas into practice to have anything better than a 50/50 chance of working. – A L Jul 03 '13 at 19:17
  • @AL The question wasn't to verify if such a segulah works or how it works or it's medically sound...But, thanks for the comment? – Yehoshua Jul 03 '13 at 20:46
  • @Yehoshua I know. It was only tangentially related so I commented. BTW as far as the danger goes, I vaguely recall that doing things in pairs makes one susceptible to witchcraft (if nobody else already mentioned that). Then again the number of witches walking around is probably... 0. – A L Jul 03 '13 at 23:46
  • "The Gemorah says in Niddah 31b הרוצה לעשות כל בניו זכרים יבעול וישנה – One who wants to make all his children males should cohabit once and then repeat it."

    Does this apply retroactively to existing children?

     – Clint Eastwood Feb 05 '14 at 15:52
  • Maybe there is a difference when the second biah happens. If done in one session maybe its considered one,and only if there was a hefsek between the biahs(meaning two sessions in one night) then it would be problematic. – sam Dec 16 '15 at 03:43

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Maybe since he has intention in gemara Niddah to achieve a specific outcome by the combination of both times he is boel, it is considered as a 'biah arichtah', whereas in Pesachim he was being 'oseh tzerachav', he did not have a higher motivation so he has done 2 seperate bios.

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