In the time of the Talmud and for centuries beyond, it was very important for a couple to produce male children. To this end, some rabbis suggested a technique to ensure that a boy was produced. Here it is described in today’s page of Talmud:
ברכות ס, א
וא"ר יצחק אשה מזרעת תחלה יולדת זכר איש מזריע תחלה יולדת נקבה
Rabbi Yitzchak said that if the woman emits seed first she gives birth to a male, and if the man emits seed first she gives birth to a female.
Today we will explore the topic of gender determination in the Talmud.
How to conceive a boy or a girl
In the tractate Niddah the statement about “emitting seed first” comes up several times, and in the name of a few different rabbis. And, as if emphasize its importance, the Talmud offers no fewer than four different supporting proofs for the principal. The first is the one that we just read in the name of Rav Ami:
נדה לא, א
אמר רבי יצחק אמר רבי אמי אשה מזרעת תחילה יולדת זכר איש מזריע תחילה יולדת נקבה שנאמר (ויקרא יג, כט) אשה כי תזריע וילדה זכר
Rabbi Yitzchak says that Rabbi Ami says:The sex of a fetus is determined at the moment of conception. If the woman emits seed first, she gives birth to a male, and if the man emits seed first, she gives birth to a female, as it is stated: “If a woman bears seed and gives birth to a male”(Leviticus 12:2).
The suggestion from the verse is that “if a woman bears seed” first, then she will “give birth to a male.” A second proof text from the Torah is provided by Rabbi Tzadok, this time from the story of our matriarch Leah.
תנו רבנן בראשונה היו אומרים אשה מזרעת תחילה יולדת זכר איש מזריע תחלה יולדת נקבה ולא פירשו חכמים את הדבר עד שבא רבי צדוק ופירשו (בראשית מו, טו) אלה בני לאה אשר ילדה ליעקב בפדן ארם ואת דינה בתו תלה הזכרים בנקבות ונקבות בזכרים
The Sages taught: At first, people would say that if the woman emits seed first she gives birth to a male, and if the man emits seed first, she gives birth to a female. But the Sages did not explain from which verse this matter is derived, until Rabbi Tzadok came and explained that it is derived from the following verse: “These are the sons of Leah, whom she bore to Jacob in Paddan Aram, with his daughter Dinah”(Genesis 46:15). From the fact that the verse attributes the males to the females, as the males are called: “The sons of Leah,” and it attributes the females to the males, in that Dinah is called: “His daughter,” it is derived that if the woman emits seed first she gives birth to a male, whereas if the man emits seed first, she bears a female.
בנדה לא ,א–ב
The Talmud brings a third proof text, this one from the Book of Chronicles:
ויהיו בני אולם אנשים גבורי חיל דורכי קשת ומרבים בנים ובני בנים וכי בידו של אדם להרבות בנים ובני בנים אלא מתוך שמשהין עצמן בבטן כדי שיזריעו נשותיהן תחלה שיהו בניהם זכרים מעלה עליהן הכתוב כאילו הם מרבים בנים ובני בנים והיינו דאמר רב קטינא יכולני לעשות כל בני זכרים
“And the sons of Ulam were mighty men of valor, archers, and had many sons and sons’ sons”(I Chronicles 8:40). Is it in a person’s power to have many sons and sons’ sons? Rather, because they delay while lying on wives’ abdomen, initially refraining from emitting semen so that their wives will emit seed first, in order that their children will be male, the verse ascribes them credit as though they have many sons and sons’ sons. And this statement is the same as that which Rav Ketina said: I could have made all of my children males,by refraining from emitting seed until my wife emitted seed first.
And finally, the fourth proof text. A later passage in Niddah (Niddah 70b-71a) cites a number of questions that the sages of Alexandria asked of Rabbi Yehoshua. One of them was how can a man ensure he has male children? Rabbi Yehoshua told them the man should do two things: marry a woman who is fit for him, and act modestly during sexual intercourse. Hold on, the sages of Alexandria replied. Many men have done that, and it didn’t help! Rabbi Yehoshua then qualified his answer, and explained that in addition to marrying an appropriate woman and being modest, a man needs to pray for a son. Rabbi Yehoshua then cited a proof text from Psalms (127:3):
הנה נחלת ה' בנים שכר פרי הבטן
Behold, children are a heritage of the Lord; the fruit of the womb is a reward
So far so good. To have male children a man needs to marry an appropriate wife, act modestly when he is intimate with her, and pray. But now the Talmud asks a question based on the proof text. What is the act for which the reward are children?
א"ר חמא ברבי חנינא בשכר שמשהין עצמן בבטן כדי שתזריע אשתו תחילה נותן לו הקב"ה שכר פרי הבטן
Rabbi Chama, son of Rabbi Chanina, says: In reward for men withholding their semen in their belly in order to allow their wives to emit seed first, the Holy One, Blessed be He, gives him the reward of the fruit of the womb, [that is, sons].
These are the four different proof texts from the Bible to support the claim that if a woman emits her seed first, she will give birth to a boy. Of course now we need to determine what, precisely, is meant by the phrase “if the woman emits seed first” (מזרעת תחילה).
Understanding THE PHRASE
(i) Ovulation
Perhaps it could refer to ovulation. This makes sense to us since we understand that fertilization requires two “seeds,” the egg, and sperm. But this would not have made sense to the rabbis of the Talmud. They, like everyone else at the time (and indeed until the beginning of the seventeenth century) had no concept of mammalian ovulation. In fact it was the blood that was lost at menstruation that was believed to be the mother’s contribution to her child’s formation, and not any eggs she may produce.
A classic example of this lack of understanding of ovulation is found in the early medieval commentary of Moses ben Nachman, known as Ramban (1194–1270) to Leviticus 12:2. Here is the key bit:
כי האשה אע"פ שיש לה ביצים כביצי זכר או שלא יעשה בהן זרע כלל או שאין הזרע ההוא נקפא ולא עושה דבר בעובר
For even though a woman has ovaries like the testes of a man, either they do not produce eggs at all, or else the egg jells and contributes nothing to the fetus.
(ii) Orgasm
The other possibility is that “emitting seed first” refers to orgasm. If you want to have a boy, the rabbis said, the husband should allow his wife to have an orgasm before himself. This interpretation is favored by the historian of all things medical and talmudic, Fred Rosner. Here is what he wrote in Medicine in the Bible and The Talmud (Ktav Publishing and Yeshiva University Press 1977, p175):
It seems obvious…that the meaning must be orgasm rather than ovulation, for otherwise it would not make sense to speak of the men restraining themselves during intercourse in order to allow their wives to “emit seed” first.
Theories of sex determination in Antiquity
In a fascinating paper in the Journal for the Study of Judaism, the scholar Pieter van Horst wrote “it is certain that ancient Greek concepts of embryogenesis influenced Jewish theories about the coming-into-being of a foetus.” So let’s look at some of those theories.
Aristotle (384–322 BCE) recorded the belief (with which he did not agree) that male offspring come from the right side of the male and females from the left side; an embryo that develops in the “right side” of the uterus (whatever that means) becomes male while that which develops in the left side becomes female. Aristotle himself believed that the mother’s contribution to the fetus was menstrual blood, and it had the same origin as male semen, although it was not as developed.
Another Greek, Empedocles (c. 494-434 BCE) thought that “heat” (whatever that means) gave rise to males and cold to females. But the view in the Talmud about editing seed first can be traced further back to another Greek, Democritus of Abdera (c. 460 - c. 370 BCE). Democritus believed that the gender depended on the parent whose semen predominated, “not the whole of the semen, but that which has come from the part by which male and female differ from one another.”
By the time we get to Galen, the Greek physician of the second century, there was an acknowledgement that the mother contributed her own seed, but, as van Horst notes the thought was that“…female sperm is by far less perfect, thinner, and colder than male sperm; it serves only as food for the male semen in its development into an embryo.
