All over the world, female travelers have a different experience than male travelers.
Many countries have very traditional customs and norms that govern how men and women interact.
One common assumption, ably fueled by movies and television, is that American women are "easy."
Men in these countries will treat American women in ways that they would not treat women from the host country.
While you may not agree with local customs, you should learn to respect and follow the laws and social norms of the host country.
In addition, you should...
Research the norms governing social behavior in the host country before the program.
Ask local women what the line between harassment and regular "machismo" action is, and how they usually handle catcalls or touching.
Unless you are particularly looking for an encounter, do not look males directly in the eye in certain countries.
Dress in clothes that blend in with the locals.
Don't ask strangers for help. If you need help, ask an authority figure, a woman or a couple.
Look confident, even when you may not be.
Avoid unsafe neighborhoods and places. Trust your gut about what is safe and unsafe.
Avoid carrying mace with you unless you are absolutely certain that it is necessary, and that carrying it is not in violation of the laws of the country in which you are traveling.
Carry condoms with you and insist on using them. If your partner resists, it's not worth risking your life.
At no point should you ever consume enough alcohol or drugs to lose awareness of your surroundings or consciousness.