Works : Islamic Laws
1593. Sexual intercourse invalidates the fast, even if the penetration is as little as the tip of the male organ, and even if there has been no ejaculation.
1594. If the penetration is less than the tip of the male organ, so that it cannot be said that intercourse has taken place, also if no ejaculation takes place, the fast does not become invalid. This applies to both, circumcised and uncircumcised men.
1595. If a person commits sexual intercourse intentionally and then doubts whether penetration was upto the point of circumcision or not his fast, as an obligatory precaution, becomes invalid, and it is necessary for him to observe its qadha. It is not, however, obligatory on him to give Kaffarah.
1596. If a person forgets that he is observing fast and commits sexual intercourse or he is compelled to have sexual intercourse in a manner that makes him helpless, his fast does not become void. However, if he remembers (that he is observing fast) or ceases to be helpless during sexual intercourse, he should withdraw from the sexual intercourse at once, and if he does not, his fast becomes void.