It is narrated from Sa'id bin al-Musayyib that the saying of Sayyiduna Umar bin Khattab (may Allah be pleased with him), Sayyiduna Uthman bin Affan (may Allah be pleased with him), and Sayyidah Aisha (may Allah be pleased with her) was that when the circumcised part touches the circumcised part, that is, when the head of the male organ disappears into the woman's private part, then ghusl becomes obligatory.