Effective Pregnancy Prevention Methods for Teenagers

Question
My wife is 17 yrs. old. We usually have intercourse once/twice in a month. Till now, we had 10 times intercourse. Infact, we use Unwanted 72 (emergency contraceptive pill) each time we intercourse. I'm not interested using condoms. Plz. suggest me the best way to prevent pregnency.

Answer
For most women, the birth control pill is the easiest and most effective way to prevent pregnancy.  Emergency contraception is meant for emergencies, and is not as effective as birth control pills.  There are many other methods of birth control, which are described here http://www.plannedparenthood.org/health-topics/birth-control-4211.htm