Spiritual Retreat: Sexual Intercourse During Iʿtikaf
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1733
While one is performing iʿtikāf, it is not permitted for him to have sexual intercourse with his spouse – even if it does not result in ejaculation – and doing so intentionally invalidates iʿtikāf.
-Ayatullah Sistani, Practical Laws of Islam, Spiritual Retreat (Iʿtikāf)