Couples that will share a kiss on a Valentine’s Day will experience not only relaxation, pleasant emotions and love for their partner. Researchers found out that romantic kiss has a positive impact on entire organism as a whole. It has the same stimulating effect on brain and nervous system, like cocaine.

Scientists found out that women need not just a kiss to experience same feelings as man with a kiss. She needs a romantic atmosphere with candles and nice music. Scientists decided to see what occurs in female and male organism during kissing at a chemical level.

They measured levels of hormones cortisol and oxytocin in 15 couples before and after a romantic embrace and kiss. Researchers noted reduction of cortisol - stress hormone, both in women and men. However, content of hormone oxytocin, which is responsible for human social behavior, increased only in men.

The same tests were conducted in a more intimate atmosphere. It turned out that level of oxytocin in women approached men indicators.

Scientists found out that a kiss is a complex chemical process. Experts suggest that pleasant feelings while kissing arise during exchange of chemicals called pheromones, which are necessary for one to attract sexual partner.