All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
It is permissible for one to have sexual intercourse with his wife whenever he likes, and there is no definite time for that, save the period of menstruation or post-partum bleeding.
The evidence for that is taken from the Statement of Allaah Almighty (which means): {Your wives are a place of sowing of seed for you, so come to your place of cultivation however you wish...}[Quran 2:223]
In his comment on that verse, Ibn ‘Aashoor said in his Tafseer:
This sentence is a further annotation of His previous Statement (which means): {…then come to them from where Allaah Has Ordained for you…}[Quran 2:222] He Intended thereby to be kind and companionable towards the addressees, to Give them the impression that preventing them from approaching their wives during the period of menstruation is temporary and just for their benefit; and that Allaah Knows well that their wives are the place of their cultivation, to which they come (whenever they like). Indeed, to be prevented from them for some time is not easy for them, had it not been for His will to Guard them from the harm (they should receive if they approach them during menstruation).
As regards speaking during sexual intercourse, a group of scholars state that it is unfavorable, and might cause the child (to be born from that intercourse) to be mute. Ibn Qudaamah said in Al-Mughni:
It is unfavorable to speak too much during sexual intercourse, due to the narration on the authority of Qabeesah ibn Thu’ayb, who said that the Messenger of Allaah, sallallaahu ‘alayhi wa sallam, said: "Do not speak too much during sexual intercourse with women, since it brings about muteness and stammer (upon the child to be born of that intercourse)." Speaking is unfavorable during urination, and having sexual intercourse is in the same position, if not worthier of that.
But the Hadeeth used by those for attestation has been rendered Dha‘eef (weak) by Shaykh Naasir Ad-Deen Al-Albaani in his As-Silsilah Ad-Dha‘eefah as shown in his saying, "Generally speaking, the chain of narrators is very weak and unfitting to establish a proof and the tradition is Munkar (abandoned)."