Sana Saeed tries to trace the "Tunisian women are going on sex jihad in Syria" story to its roots -- which turn out to be tangled and possibly non-existent. As Saeed notes, any story with the words "sex" and "jihad" in the title is going to be catnip to the international press. And making an accusation like this (which Tunisia's Minister of Interior did recently) may be an easy way to embarrass/discredit Islamists.
Despite the story having gained traction of the viral variety, and despite the concerns and facts expressed by Tunisian officials, there seems to be actually very little evidence to suggest that the so-called sexual Jihad is actually a thing (and Jihad al-Nikkah is not a thing in Islamic jurisprudence).
The story of Tunisian women returning from waging sex on holy warriors (thanks RT) in Syria impregnated with future warrior babies itself is, at best, just incredibly questionable and many, from the onset of the story’s break into the English press, expressed deep skepticism. In a civil war that has had many ideological fronts, the most pernicious in is salience has perhaps been that of information. Syria has been a cluster of misinformation, misattribution and propaganda. O’Bagygate and Mint Press-gate are two of the most recent headlines to highlight the problems in not only reporting on the conflict but also how easily questionable, untrue, unverified information is gobbled up to serve ideological biases and wishful thinking.