Green with dampness. Red is the most active color, blue the most passive; green, in the middle, is the color of neutrality and calm, sometimes used in architecture and design for these reasons. Blue and green together symbolize harmony and balance. Green is often associated with jealousy and envy. The expression "green-eyed monster" was first used by William Shakespeare in Othello: "it is the green-eyed monster which doth mock the meat it feeds on." Shakespeare also used it in the Merchant of Venice, speaking of "green-eyed jealousy." Green today is not commonly associated in Europe and the United States with love
Jealousy protect their partner. Experts often believe that sexual jealousy is in fact a biological imperative. It may be part of a mechanism by which humans and other animals ensure access to the best reproductive partners. It seems that male jealousy in heterosexual relationships may be influenced by their female partner's phase in her menstrual cycle. In the period around and shortly before ovulation, males are found to display more mate-retention tactics, which are linked to jealousy. Furthermore, a male is more likely to employ mate-retention tactics if their partner shows more interest in other males, which is more likely to