Don't hail a taxi. That was the first piece of advice I was given by friends when I arrived in Cairo last week. They explained that because of a spate of well publicised sexual abuse cases and harassment of both Western and Egyptian women after some shocking incidents in Tahrir Square, the birthplace of the revolution, it was wise to err on the side of caution.
Egypt used to be a place where you never gave a second thought to personal safety. Egyptians are hospitable, charming and honest - on the whole - but the polarisation of society, the rise of the Islamists, and the arming of citizens amid civil strife mean that things are changing.
On a lunchtime stroll through the campus of Cairo university, I noticed that almost every young woman was wearing the Muslim headscarf known as the hijab. The only person who wasn't wearing one turned out to be an Italian. Yet being Egypt, the students combine the colourful scarves with skin-tight jeans, a living metaphor for the cohabitation of traditional and modern customs.
Egyptians friends told me that their daughters have come under increasing peer pressure to wear the headscarves at school and university since the Islamist Muslim Brotherhood and the even more radical Salafists won the elections last year. One friend, who has two daughters, says that given the Islamists' attitude towards women and girls' education his family might not stick around for much longer.
The Muslim Brotherhood is rumoured to have infiltrated the Education Ministry even before the revolution. The Salafists are so extreme that they believe even going to the hairdressers is wrong. The latest example of the Islamists' intolerance is Egyptair considering whether its inflight entertainment is in line with "Egyptian values and customs" after a Brotherhood member took offence at a film screened by the airline.