India is a male dominated world with a lot of pent up violence. Women would do well to avoid this region when traveling. Their have been reports of various gang rapes in public areas. It is unsafe for a female to travel to India at all, much less alone. I don't see this problem changing soon.
Cautioning female travelers about the potential dangers of countries like India is good to help them take preventative measures to stay safe, but it would not be fair to tell women to avoid India altogether. If a woman has a chance to travel there and see the amazing historical sites and sample the culture, she should not pass it up out of fear.