Sexually transmitted diseases (STDs) are infections that are passed from one person to another through sexual contact. The causes of STDs are bacteria, parasites, yeast, and viruses. There are more than 20 types of STDs, including. Chlamydia. Genital herpes. Gonorrhea.
Society for Endocrinology. Hormones. Oxytocin is a hormone that acts on organs in the body (including the breast and uterus) and as a chemical messenger in the brain controlling key aspects of the reproductive system including childbirth and lactation, and aspects of human behaviour.
Many organs have glandular activity, usually provided by specific cells within the organ. Mucin is secreted by specialized cells of the intestine, insulin by specialized cells of the pancreas, hydrochloric acid by specialized cells of the stomach. That doesn't mean that the intestine, pancreas, and stomach are not organs. An organ is any structure composed of multiple tissue types working as a unit.