adolescent stage are characterized by dynamic changes in physical and behavioral traits

broadening of shoulders and chest, growth of facial and body hair, growth of penis and testicle, increase in muscle mass and strength, voice deepening

breast development, increased body fat distribution, particularly in hips and thighs, onset of menstruation, widening of hips

these changes are primarily driven by hormones, starting 8-13 for girls and 9-14 for boys, though there can be considerable variation

emotional and mood changes, development of sexual attractions and feelings, growth spurts, increased sweating, skin changes

sperm and egg

are responsible for producing sperm and egg

testes

ovaries

all of the structures that make the female external genitalia

a cushion of fatty tissue, covered by skin and pubic hair, that lies over the pubic symphysis

the sensitive area located at the top of vulva. touching this area can make you feel sexually aroused and lead to climax or orgasm

end of tube connecting to bladder and used for urination

it is where mentrual blood leaves the body. it is also used to birth a baby and for sexual intercourse

the outer lips and are usually larger. they are covered with pubic hair

the inner lips protecting the opening of the urethra and vagina

is the area of skin that separate the genetalia from anus. distance if less in female than male

is the opening at the end of digestive system to which solid waste leaves the body

is a muscular canal aligned with nerves and mucos membranes. it connects cervix and uterus outside the body allowing menstruation, childbirth and intercourse

it connects the uterus to the vagina. it allows fluid, such as menstrual blood pass from uterus to the vagina. it widens during childbirth

womb, it is nourishes or house fertilized egg until the fetus or offspring is ready to be delivered

it carries the egg from ovaries to uterus, this is where fertilization occurs

it produce and store eggs (ovum) and make hormones (estrogen and progesteron) to control menstrual cycle and pregnancy

the foreskin covering head of penis, removed in male circumcision

the shaft is the longest part of it. the head or glans is at the end of the shaft.

is the opening at the tip of the head, where urine and semen come out

rim of glans where it arises from shaft

the thin strip of skin connecting glans and shaft on underside of penis

a sac that encloses the two compartments housing the testes

found on the head of the penis, this is the end of tube connected to bladder and used for urination. it is also a tube to which internal structure deliver semen by which male ejaculates

the presence of foreskin around the head of the penis

it provides structural support and protection for their reproductive organs

it transport sperm from the epididymis to the urethra during ejaculation

it produces a fluid that nourishes and activates sperm, forming part of the semen

it produces prostatic fluid, a component of semen that help nourish and protect sperm

the final section of the large intestine, responsible for storing feces before elimination

it produces sperm and testosterone, the primary male sex hormone

sperm’s only function us to fertilize female sex cells. not ejaculating or releasing semen won’t hurt you or cause any problems as your body absorbs any sperm you don’t release

15M to 200M per mililiter of semen

oligospermia; less than 15M sperm per mililiter of semen

after unprotected intercourse, sperm cell travel through the vagina, cervix, uterus and eventually fallopian tubes.

sperm can stay within the female reproductive system for five days. unejaculated sperm can stay alive in your testicle for 2.5 months

sperm can live up to an hour in a room temperature of 20 degrees celsius, diff. temperature can kill sperm quickly. sperm can survive for decades as long as the freezing condition remains the sane