The group, under the name of Raqqa is Being Slaughtered Silently (RBSS) published a detailed account on its website this month which outlined the group's behaviour towards women in the area.It wrote: “A large selection of IS suffer from sexual anomalies and brutal instinctive desire for sex.”The group also notes IS members to be "buying strange underwear" for their partners, and marrying more than one woman. At the same time they were listed as having sex with captives or slaves.The group adds that fighters also search for "blue pills in order to increase their strength to have more sex" in an obvious reference to the Viagra which enhances make potency.The report further adds that many women have been forced to seek treatment in hospitals after being "subjected to sexual practice in a brutal and abnormal manner."Experts have identified Raqqa as a 'hotspot' for young British girls who have travelled to join the extremist fighters. These females are said to be behind an ultra-religious all female militia which is brutally punishing "un-Islamic" behaviour in the area.Raqqa is also identified as the town closest to where US journalist James Foley was beheaded.In recent times, experts have warned that women are the new target for IS recruitment as researchers have seen unprecedented calls for fighters to marry British and European women.Most of these women are said to be teenagers and are bombarding IS fighters with marriage proposals during social media 'Q&As' and researchers have estimated that as many as 50, most of them British, could have already gone to join fighters in Iraq and Syria."Typically, the women who are out there tend to form clusters, they might be married to IS fighters in the same unit," said Melanie Smith, a research associate at the International Centre for the Study of Radicalisation (ICSR), King's College, who monitors the recruitment of women by IS.The ICSR warned that many more young women had made inquiries about travelling to Iraq and Syria in the following months after Foley's beheading.RBSS describes itself as a group of non-violent activists in Raqqa campaigning to expose the atrocities committed by the regime of President Bashar al-Assad and IS toward the civilian populations of the city.Members of the group allegedly live in safe houses spread across the city and coordinate via the internet, using encryption to foil IS hackers.