{ It is lawful for you to do things [rafth] with your women on the night of fasting; they are your clothing and you are their clothing. Allah has known that you have been betraying yourselves, and He has turned to you and forgiven you; so now have sexual relations with them and seek after what Allah has ordained for you } Al-baqara 187

This verse is license from Allah Most High to the Muslims to lift what was a commandment in the beginning of Islam; this was that whenever any of them broke the fast, he was permitted to eat, drink, and have sex until the night prayer [‘ishaa], unless he slept before then. When he slept or prayed the night prayer, food, drink, and sex were forbidden to him until the following night. But they found this to be a great hardship. And "rafth" here is sex.