There are the hormones-nejtrofiny, which high concentration in blood and causes the raised condition, characteristic for the initial stage of love relations. These hormones cause also inflow of a sexual inclination, which strongest at early stages of relations. Scientists consider, that in the future, probably, it will be possible to synthesise nejrofiny, causing a love condition "at will". However it meanwhile far prospect.

Besides, in an organism of the enamoured woman level testosterona raises. However, in due course level of hormones settles into shape.