Praise be to Allaah.
Intercourse with one’s spouse is allowed between maghbrib and fajr during Ramadaan, because Allaah says (interpretation of the meaning): “It is made lawful for you to have sexual relations with your wives on the night of the fasts. They are libaas [garments, body cover, screen] for you and you are the same for them. Allaah knows that you used to deceive yourselves, so He turned to you (accepted your repentance) and forgave you. So now have sexual relations with them and seek that which Allaah has ordained for you (offspring), and eat and drink until the white thread (light) of dawn appears to you distinct from the black thread (darkness of dawn), then complete your fast until the nightfall. And do not have sexual relations with them (your wives) when you are in I’tikaaf (spiritual retreat) in the mosques. These are the limits (set) by Allaah, so approach them not. Thus does Allaah make clear His aayaat (signs) to mankind that they may become al-muttaqoon (the pious).” [al-Baqarah 2:187].