Women will generally find Cambodia a hassle-free place to travel, although some of the guys in the guesthouse industry will try their luck from time to time. Foreign women are unlikely to be targeted by local men, and will probably find Khmer men to be courteous and polite. At the same time it pays to be careful. As is the case in many places, walking or riding a bike alone late at night can be risky.
Khmer women dress fairly conservatively, in general preferring long-sleeved shirts and long trousers or skirts. It is worth having trousers for heading out at night on motos (motorcycle taxis), as short skirts aren’t very practical.
Tampons and sanitary napkins are widely available in the major cities and provincial capitals, but if you are heading into very remote areas for a few days, it is worth having your own supply.