On my first day in Bogota l went into the city with a friend and could not believe the attention l was attracting. Men tend to stare at you and hiss. I always found travelling with a man is so much safer. Although not possible all the time, just ignore them. It won't stop them from staring but acting confident does help. Never accept anything from a stranger including sweets, drinks, food or cigarretts. They may be well drugged which can cause memory loss and when, or if your lucky to wake up alive you won't remember anything and all your belongings taken. Take heed especially in clubs and bars. Always have your friends watch your drink if you need leave it unattached. Never get into a cab on your own.