There's nothing subtle about the females travelling to the Middle East to offer up themselves as sex objects for the insatiable Islamic State fighters in Syria and Iraq. Not just the 3 Malaysians mentioned by Malaysian Insider, Sunni women from Australia and the United Kingdom are also participating in the Jihad Al Nikah (Arabic: جهاد النكاح, often translated as Sex jihad or Sexual jihad), draining the energies of the combatants who probably need it more on the battlefield. It's enough to give the comfort women of World War II a bad name.
Apparently it started after the fall of the town of Mosul, and people were ordered to send their unmarried women to jihad for sex. Note the unabashed request for virgins - these nuts should kill themselves and collect their entitlement of 70 unsoiled maidens in the after life. During WWII businessmen shipped willing prostitutes overseas to service the troops. It was only when the supply ran out that local females were "recruited" to staff the pleasure barracks. Cruel as it may be, at least the Japs didn't invoke a religious entity to justify their atrocity.