Machismo is alive and well in Brazil, but it's a kinder, gentler machismo than in other parts of Latin America. Single women and a few women traveling together will undoubtedly attract masculine attention. There are upsides to this. It's usually fairly harmless and can sometimes lead to some fun conversations. Brazilian men, it seems, have an insurmountable urge to flirt. Perhaps because flirting is such a way of life, they take rejection well. Indeed, the object of the exercise lies mostly in the act of flirtation itself -- actually making a conquest appears to be not terribly important. Wearing a wedding ring (fake or real) will throw up only the flimsiest of barriers; it will be either completely ignored, seen as a challenge, or solicit questions such as "How married are you?" or "What kind of husband would let you out of his sight?" However, if you are not interested, just say so or walk away if necessary and that is usually enough. The downside is that it's difficult for a woman to go out for a drink by herself and not receive attention. If you're not comfortable with this, you may want to form up a mixed group with other travelers or else stick to higher-end restaurants or hotel bars. Brazilian women in groups of two or three often link arms or hold hands as a sign that they are not interested in male attention. Use common sense to avoid situations where you may find yourself alone with someone giving you unwanted attention. At night, taking taxis is safer than walking by yourself.
Some hotels, particularly in larger cities, now offer women-only floors. The Metrô in Rio has women-only cars -- painted pastel pink -- for the exclusive use of women travelers during rush hours.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.