In the economy, there is a circular flow of income and spending. 1  Everything is connected. Money that is earned flows from one person to another, and most of it gets spent again - not just once, but many times.
Stage 1: excitement or arousal. A man gets an erection with physical or psychological stimulation, or both. This causes more blood to flow into three spongy areas (called corpora) that run along the length of his penis. The skin is loose and mobile, allowing his penis to grow.
Sexual pain disorders are psychological syndromes that cause pain during sex. There are two sexual pain disorders: dyspareunia and vaginismus. Dyspareunia can be found in both men and women and involves pain during intercourse.