Contraception is a form of abortion Contraception separates sex from reproduction Contraception brings bad consequences These are consequentialist arguments against contraception. Contraception carries health risks The "contraceptive culture" is dangerous Contraception prevents potential human beings being conceived Contraception prevents people who might benefit humanity from being born Contraception can be used as a eugenic tool Contraception is often misused in mass population control programmes in a racist way Mass population control programmes can be a form of cultural imperialism or a misuse of power Contraception may lead to depopulation This sounds odd to an age concerned about overpopulation but for substantial parts of the s and s this was a real fear.
Puberty Upper body of a teenage boy. The structure has changed to resemble an adult form. Puberty is a period of several years in which rapid physical growth and psychological changes occur, culminating in sexual maturity.
The average age of onset of puberty is at 11 for girls and 12 for boys.
Hormones play an organizational role, priming the body to behave in a certain way once puberty begins,  and an active role, referring to changes in hormones during adolescence that trigger behavioral and physical changes.
This is triggered by the pituitary glandwhich secretes a surge of hormonal agents into the blood stream, initiating a chain reaction to occur.
The male and female gonads are subsequently activated, which puts them into a state of rapid growth and development; the triggered gonads now commence the mass production of the necessary chemicals.
The testes primarily release testosteroneand the ovaries predominantly dispense estrogen. The production of these hormones increases gradually until sexual maturation is met. Some boys may develop gynecomastia due to an imbalance of sex hormonestissue responsiveness or obesity.
The first facial hair to appear tends to grow at the corners of the upper lip, typically between 14 and 17 years of age. This is followed by the appearance of hair on the upper part of the cheeks, and the area under the lower lip. Facial hair is often present in late adolescence, around ages 17 and 18, but may not appear until significantly later.
Early maturing boys are usually taller and stronger than their friends. Pubescent boys often tend to have a good body image, are more confident, secure, and more independent. However, early puberty is not always positive for boys; early sexual maturation in boys can be accompanied by increased aggressiveness due to the surge of hormones that affect them.
Girls attain reproductive maturity about four years after the first physical changes of puberty appear. Adolescence is marked in red at top right. The first places to grow are the extremities—the head, hands and feet—followed by the arms and legs, then the torso and shoulders. During puberty, bones become harder and more brittle.
At the conclusion of puberty, the ends of the long bones close during the process called epiphysis. There can be ethnic differences in these skeletal changes. For example, in the United States of America, bone density increases significantly more among black than white adolescents, which might account for decreased likelihood of black women developing osteoporosis and having fewer bone fractures there.
This process is different for females and males. Before puberty, there are nearly no sex differences in fat and muscle distribution; during puberty, boys grow muscle much faster than girls, although both sexes experience rapid muscle development.
In contrast, though both sexes experience an increase in body fat, the increase is much more significant for girls.
Frequently, the increase in fat for girls happens in their years just before puberty. The ratio between muscle and fat among post-pubertal boys is around three to one, while for girls it is about five to four. This may help explain sex differences in athletic performance.
These changes lead to increased strength and tolerance for exercise. Sex differences are apparent as males tend to develop "larger hearts and lungs, higher systolic blood pressure, a lower resting heart rate, a greater capacity for carrying oxygen to the blood, a greater power for neutralizing the chemical products of muscular exercise, higher blood hemoglobin and more red blood cells".
For example, girls tend to reduce their physical activity in preadolescence   and may receive inadequate nutrition from diets that often lack important nutrients, such as iron.
Reproduction-related changes Primary sex characteristics are those directly related to the sex organs.
In males, the first stages of puberty involve growth of the testes and scrotum, followed by growth of the penis. The first ejaculation of seminal fluid generally occurs about one year after the beginning of accelerated penis growth, although this is often determined culturally rather than biologically, since for many boys first ejaculation occurs as a result of masturbation.
Menarchethe beginning of menstruation, is a relatively late development which follows a long series of hormonal changes. Changes in secondary sex characteristics include every change that is not directly related to sexual reproduction.Argumentative Essay: Solution to Teenage Pregnancy Teenage pregnancy is a problem for all involved.
It puts a great strain on the parents, especially the mother, and also on their parents who, more often than not, end up with the new baby in their family home, often having to look after it while the baby’s parents are at school, or out socializing and doing the things that teenagers do.
Teen Pregnancy Teen pregnancy has dramatically decreased within the last decade because of the increased used of contraception. In , the National Center for Health statistics recorded 29 births for every 1, girls, which has decreased since when 62 births per 1, girls was recorded. Preventing Teenagers from Getting Contraceptives Unless They Tell a Parent Puts Teens at RiskToday, in every state, sexually active teenagers can get contraceptives to protect themselves against unplanned pregnancies and sexually transmitted diseases - even if they can't talk about sex with their parents.
But some state and federal lawmakers want to take away teens' ability to protect themselves. A new study from the National Center for Health Statistics on teen sex and sexual health reveals that many teens use contraceptives.
Dear Twitpic Community - thank you for all the wonderful photos you have taken over the years. We have now placed Twitpic in an archived state. start seeking information on birth control a year or more after they become sexually active, furthermore, only one out of three 15 to 19 year olds use birth control each time he or she has intercourse (Lockhart & Wodarski, ).