Boys and girls must choose the time of intercourse and have sex before they can conceive naturally to produce a new life. Those who cannot conceive naturally can have assisted reproduction techniques to produce a new life. Boys and girls should choose to have intercourse after the female ovaries have mature follicles, both men and women have the ability to procreate, and the chances of the female getting pregnant after having sex are higher. Some men and women have infertility problems and are unable to conceive naturally, so they can go to the hospital to have a new baby through assisted reproduction techniques. Microscopic techniques are used to manipulate gametes and embryos outside of the body, including artificial insemination (AI) in vitro fertilization (IVF) and embryo transfer techniques.