These sources accompany the (mini) eight episode of the Joy of Text podcast.
אמר רב אפילו שיחה יתירה שבין איש לאשתו מגידים לו לאדם בשעת מיתה איני והא רב כהנא הוה גני תותי פורייה דרב ושמעיה דסח וצחק ועשה צרכיו אמר דמי פומיה דרב כמאן דלא טעים ליה תבשילא אמר ליה כהנא פוק לאו אורח ארעא לא קשיא כאן דצריך לרצויה הא דלא צריך לרצויה
Rav said: Even frivolous speech that is between a man and his wife before engaging in relations is declared to a person at the time of death, and he will have to account for it. The Gemara asks: Is that so? Is it prohibited for a man to speak in this manner with his wife? Wasn’t Rav Kahana lying beneath Rav’s bed, and he heard Rav chatting and laughing with his wife, and performing his needs, i.e., having relations with her. Rav Kahana said out loud: The mouth of Rav is like one who has never eaten a cooked dish, i.e., his behavior is lustful. Rav said to him: Kahana, leave, as this is not proper conduct. This shows that Rav himself engaged in frivolous talk before relations. The Gemara answers: This is not difficult. Here, where this type of speech is permitted, it is referring to a situation where he must appease his wife before relations, and therefore this speech is appropriate. However, this statement, that it is prohibited, is referring to a situation where he doesn’t need to appease her. In these circumstances, it is prohibited to engage in excessively lighthearted chatter with one’s wife.
ואץ ברגלים חוטא זה הבועל ושונה איני והאמר רבא הרוצה לעשות כל בניו זכרים יבעול וישנה לא קשיא כאן לדעת כאן שלא לדעת:
“And he who hastens with his feet sins”; this is one who has intercourse with his wife and repeats the act in a manner that causes her pain or distress. The Gemara is surprised by this teaching: Is that so? But didn’t Rava say: One who wants all his children to be males should have intercourse with his wife and repeat the act? The Gemara answers: This is not difficult: Here, where Rava issued this advice, he was referring to a husband who acts with his wife’s consent. There, the baraita that condemns this behavior is referring to one who proceeds without her consent.