Wa`alaykum As-Salamu wa Rahmatullahi wa Barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
Dear sister in Islam, we would like to thank you for the great confidence you place in us, and we implore Allah Almighty to help us serve His cause and render our work for His sake.
As far as Islamic Shari`ah is concerned, a Muslim is allowed to have intercourse with his or her spouse after breaking the fast and until dawn (the time of abstention from food, drink, and gratifications). However, one who is fasting should never overstep the boundaries of fasting by having intercourse with his or her spouse while fasting.
In his response to your question, Sheikh Ahmad Kutty, a senior lecturer and Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states the following:
While it is forbidden to establish any conjugal relations with one’s spouse while one is fasting during the day, one is certainly allowed to do so during the night until the arrival of dawn (i.e., fajr).
Allah says: [It is made lawful for you to go to your wives (in sexual relations) on the night of the fast. They are a garment for you and you are a garment for them. Allah knows that you were deceiving yourself in this respect and He has turned in mercy towards you and pardoned you. Therefore you may now have intercourse with them and seek what Allah has ordained for you. Eat and drink until the white thread (of dawn) becomes distinct to you from the black thread (of night)] (Al-Baqarah 2:187).
In short, we are allowed to enjoy intimate sexual relations after breaking the fast throughout the night until the time of abstention from food, drink, and gratifications (i.e. when the time of fajr arrives).
Excerpted, with slight modifications, from: www.islam.ca.