Melan,
It's always a good idea to use a condom, but as they don't cover the entire genital area, it is not a failsafe method. That being said, it still significantly reduces your chance of infection. HPV is transmitted by skin to skin contact. The best way to avoid HPV is to avoid multiple sexual partners and keep your body healthy so that it can fight off infections that may occur.
KeriSS,
There are over 100 strains of HPV and studies have shown that the same strain of the virus does not continually get passed back and forth between partners who are monogamous. (http://www.asccp.org/hpv_history.shtml). Don't be nervous! Your body takes care of most HPV infections on its own. But if the infection persists, there are treatment options. The important thing is to stay healthy and keep your immune system strong so that it can fight the infection. Eat your vegetables and talk to your doctor and/or naturopath for a treatment protocol.