My girlfriend and I are thinking about taking the next step in our relationship and engaging in sex. She isn’t on birth control due to her parents being against it. I have told her that when the time comes the precautions I will take is wearing a condom, pulling out, spermicide, and timing it right with her cycle. She is still worried. Obviously abstinence is the only 100% effecting birth control but with all those methods used correctly, is there any need to worry?