is it possible for a man to be raped by a woman or group of women

i was just chilling on my bed the other day listening to a broadcast on the radio. the topic of discussion was quite interesting. it was about violence against women and this lead to how to stop women from being raped and so on and so forth. the moderator then asked a vital question is it possible for a man to be raped by a woman or group of women. The answer the resource gave was no it is not possible and i thought to myself is that right cos i know i have heard of cases of guys that have been gang raped by ladies. there are a couple of such peculiar cases on line i checked on line and got a few cases

Gang Raped By 10 Women This is just a brief summary of an actual crime that happened on the 22.10.10 / 10.22.10

10 Papua New Guinea women are being held in custody after they kidnapped a 17 year old boy and attacked him using machetes and kitchen knives and at least four women are reported for aggravated rape. It is unknown whether the women have HIV AIDS or any sexually transmitted infections. He was treated at hospital and awaiting test results. Rape is a heavily under reported crime in Papua New Guinea and has a high sexual violence rate and Police are now warning males to be careful .

this is one among numerous cases I do hope the poor school boy is recovering well and receiving vital support from his family and community as this can be a very taboo subject. so what do you think and i ask the question is it possible for a man to be raped by a woman or a group of women  please comment ?