Marital relationship certainly gets strengthened through an open-minded sexual encounter. Physical union is a way of expressing your love and affection for the other partner. From thins angle, there should not be any harm in husband and wife sharing their wildest sexual fantassies. If a spouse (either husband or wife) wants to criticise the other's fantassy, the other should be open to such criticism. The physical acts in any case should be performed with the consent of both partners, for instance, some individuals may find oral sex very exciting while others may not find it so interesting. In my opinion, both husband as well as wife should openly demand fulfilment of their fantassies and intersts and enjoy the God's gift to the fullest extent. Giving pleasure to your partner multiplies your own pleasure many times.