The decision to have sex, be it the first time, the first time in with new partner, or at anytime during a relationship, is a big decision. You are making the decision to express yourself in a very intimate and emotional way.
Before deciding to have sex you should consider safe sex, dealing with both the possibility of pregnancy and transmitting or acquiring a STI (Sexually Transmitted Infection). There are many methods on the market to deal with contraception. But to protect yourself and your partner from STIs, you must use a condom each and every time you have sex (oral, anal or vaginal). To find out more about methods of contraception, the rates of effectiveness, methods of use, and costs associated, see your doctor and browse the below links.
TIP - Practice sober sex. Although alcohol and drugs do not cause STIs, they may be factors leading to unsafe sex. Make the decision to have sex when you are not under the influence of anything that may inhibit your decision making.
More Information:
Sexuality and U, Methods of Contraception
Safe Sex Information
National Women's Health Network
Planned Parenthood Federation of America
Public Health Agency of Canada
Birth Control Centre