The oral cavity includes:
O
Mouth, Pharynx, and Espohagus
O
Mouth, Larynx, and Esphophagus
Larynx, Throat, and Stomach
O
Teeth, Mouth, and Vocal cords

i'm not sure how to give a good definition appropriate for health class, but you can use fingers or some form of device, often (delta india lima delta oscar). it is particularly difficult for women to achieve orgasm, especially compared to men. i have heard the easiest way is a (charlie lima india tango oscar romeo india sierra) orgasm, rubbing the (charlie lima india tango oscar romeo india sierra) , or a g-spot orgasm, however the g-spot is said to be particularly hard to find. there has been some speculation as to whether it is even real.

note: for words found inappropriate, i spelled them out in the phonetic alphabet in parenthesis, so take the first letter of each word to get the word i was trying to spell

true child development specifically