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Science tells us that due to foreplay the hormonal picture modifications: in the situation of ladies probably the most renowned intercourse hormones are dopamine, noradrenaline and phenylethylamine (even so the list is prolonged and a number of other hormones are very important in the course of sexual intercourse) which bring about: increased heart charge heart, elevated body temperature, hypersensitivity from the erogenous zones (i.e. the parts of your body most delicate to sexual stimulation) like the nipples, clitoris and vagina. The latter, the vagina, under the impact of hormones stretches and starts to lubricate.