A woman can get pregnant even if a man doesn't penetrate during sex. If the penis touches the opening of the vagina or if semen comes in contact with the vagina when the man ejaculates, sperm can enter through the vaginal fluid and reach the ovaries for fertilisation. It only takes one sperm to make a woman pregnant. Use family planning to avoid unwanted pregnancy, and ALWAYS use a condom when having sex to protect against pregnancy and infection.
Attribution: Straight Talk Foundation