After first agreeing to meet their victims in their homes, one of the women would show up accompanied by a female friend, the Metro newspaper reported.
The would-be victims then innocently shared coffee or drinks with the women before becoming inexplicably drowsy as conversation continued.
The next thing the victims remember is waking up in the middle of the night, or early the next morning, to find their homes had been ransacked.
In at least one case, a man awoke to find his date was gone. Instead, two men had come into his home and proceeded to beat him before making off with his valuables.
Computers, mobile phones, and cash were among the items taken.
In some cases, however, the online dating gang also made off with meat, chocolate, and washing powder, Metro reported.
The sophisticated female fraudsters also cleaned up after themselves to cover their tracks, leaving glasses sparkling clean on the countertop and emptying ashtrays to avoid leaving any traces of DNA.
At least ten men in southern Sweden were duped by the women, who came in contact with the men via online dating site Badoo.
After an extensive investigation in which police analyzed chat-site logs and surveillance camera footage, two women, aged 28 and 32, have been charged in Malmö. Two men aged 35 and 57 have also been charged, suspected of serving as the women's driver and navigator.
The robberies took place in several locations in southwestern Sweden, including Malmö, Eslöv, Sölvesborg, and Halmstad.
During questioning, one of the women hinted that the duo was not alone in preying on men looking for a date with an attractive women.
"Lots of other women are doing the same thing," she told investigators, according to Metro.