Ruling on one who has intercourse with his wife during the day in Ramadaan a number of times, not knowing the ruling
Question

                What Ruling on one who has intercourse with his wife during the day in Ramadaan a number of times, not knowing the ruling?
Praise be to Allah.Undoubtedly 
    Allaah has forbidden His slaves to eat, drink or have intercourse during the 
    day in Ramadaan, or to do anything that might break the fast.  He has 
    enjoined that the one who has intercourse during the day in Ramadaan, who is 
    accountable, of good health and settled, not sick or traveling, has to offer 
    expiation (kafaarah), which is freeing a slave; if he cannot afford that, 
    then he must fast two consecutive months. If he is unable to do that then he 
    must feed sixty poor persons, giving each one half a saa’ of the staple food 
    of the country. But with regard to one who has intercourse during the day in 
    Ramadaan, and who is one of those who are obliged to fast because he is an 
    adult, in good health and settled (not traveling), but he was ignorant of 
    the ruling – there is a difference of opinion among the scholars in this 
    case. Some of them said that he has to offer the expiation because he was 
    negligent and did not bother to ask and find out about the religion. Other 
    scholars said that he does not have to offer expiation because of ignorance. 
    From this you can know that in order to be on the safe side, you should 
    offer the expiation, because of your negligence and not asking about what is 
    forbidden for you before you did what you did.  If you cannot free a slave 
    or fast, it is sufficient for you to feed sixty poor persons for each day 
    that you had intercourse. So if you had intercourse on two days, you have to 
    offer two expiations; if you had intercourse on three days, you have to 
    offer three expiations, and so on, one expiation for each day you had 
    intercourse. But if you had intercourse several times on one day, one 
    expiation is enough for that. This is so as to be on the safe side and this 
    is better for you, so that you will be free of blame and will avoid an area 
    concerning which there is scholarly dispute, and to make up for your fasts. 
    If you do not remember the number of days on which you had intercourse, then 
    do what is on the safe side, which is the higher number – so if you are not 
    sure whether it was three or four days, assume it was four, and so on. But 
    you should not do anything except what you are sure about. May Allaah help 
    us and you to do that which pleases Him, and frees us from blame.