What should be the limit of the relations between spouses when they are fasting?
A person must avoid everything that invalidates fasting as well as doubtful acts and behaviors that decrease the degree and rewards of fasting. Having sexual intercourse intentionally in Ramadan while fasting invalidates the fast; and requires both qada and kaffarah (Bukhari, Sawm, 30). Kissing and hugging between spouses do not invalidate the fast. However if ejaculating happens in this situation, fasting is invalidated and qada is required for the day (Marghinani, al-Hidayah, II, 256).
Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS,