The age at onset and rapidity of sexual development vary and are influenced by genetic and environmental factors. Sexual maturity begins earlier today than a century ago, probably because of improvements in nutrition, general health, and living conditionseg, the average age of menarche has decreased by about 3 years over the past 100 years. Sexual maturity begins earlier today than a century ago, probably because of improvements in nutrition, general health, and living conditions. For example, the average age that girls begin menstruating has decreased by about 3 years over the past 100 years. However, whenever sexual maturation begins, it typically occurs in the same order. Describe the physiological basis of sexual development and orientation. Examine the interaction between hormones, the body, and behavior, including sex differences in brain morphology and the hormonal control over sexuality. The sexual maturation and growth of the female (vagina, uterus, oviduct, secondary sexual characteristics, breast stromal and ductal development, accelerated bone growth phase and closure of the epiphysis of long bones, growth of ancillary hair and pubic hair, alteration of body fat to produce typical female contours, pigmentation of the.). The process of sexual development, maturity and orientation abstract this paper discusses the process of sexual development, sexual maturity and sexual orientation from a developmental physiological psychology perspective, including a discussion of the interaction among hormones, the environment and behavior as it relates to sexual development. Puberty is the process of physical changes through which a childs body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads the ovaries in a girl, the testes in a boy. In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones, muscle. In plants a hormonal signal is sent from the leaves to the shoot apex, which stimulates sexual reproduction and development. Contributing factors to sexual maturity in plants are size, age, ecology, environment, sun exposure, competition, nutrients and temperature. Early adolescence is a precarious period in youths sexual development because of the inter-relationship between sexual development, cognitive development, and emotional development. Youth at this age lack the cognitive and emotional maturity that is necessary to make wise and healthy decisions regarding their sexuality and are ill-prepared to. The genital zone plays the most important part in the process of sexual ripening. There may also be a danger of a premature development of sexual psychology. It happens sometimes that children 9 years old look for pornographic pictures and watch adults behavior with an unhealthy curiosity. Sexually explicit, planned, or aggressive sexual acts are not a typical part of sexual development. Other rare sexual behaviors include putting objects in the vagina or rectum, putting ones mouth on sexual parts, or pretending toys are having sex.