The endocrine system is really a band of glands that regulate our bodies with hormones. The glands are ductless, in order that they release hormones directly into the bloodstream. Hormones are chemical messengers which have specific targets called receptors. There are three kinds of hormones: steroid hormones, amino acid derivatives, and peptide hormones. The concentration of hormones inside bloodstream is regulated through feedback loops. 1. Work Hard and Rest Harder "Discontinuation of sexual intercourse" is Latin because of "disrupted sexual intercourse." What happens is that the man pulls the penis out of the vagina before ejaculation. In general, this means that he "shoots" onto a woman's thigh or abdomen. Although this is an unreliable method, itc is certainly better than not using anything.