In this chapter, the authors explore our bodies and our sexual anatomy. They clarify the differences between our reproductive and sexual processes and explore the different body systems involved in sexual arousal. A proportion of babies are born with indeterminate genitals; some are allowed to develop until puberty to see what changes emerge and some undergo surgical operations. Women, however, have separate sexual and reproductive organs, which work independently of each other. Women can be sexual at any time but are actually in a physiological infertile state most of their adult life. This is because, between puberty and menopause, women are fertile for only a few days a month, and, during these years, they might have times of being pregnant or breastfeeding. Orgasm is a reflex action through the nervous system, due to a surge of hormones. It culminates in a release of sexual energy, and pleasurable muscle spasms.