What is an orgisim ?

Physically, an orgasm is the sudden rhythmic muscular contractions of the pelvic area that happens because of the release of built-up sexual tension. Typically lasting for several seconds, these contractions result in pleasurable sensations that are then followed by rapid relaxation. An orgasm also has a psychological component — a feeling of abandon and pleasure, a time when a person is focused primarily on his or her own experience. An orgasm does not just happen around the pelvis. Muscles throughout your body contract and brain wave patterns change.

pretty much its a really good sensation that makes you feel really good after!