The clitoris is a female genital organ. It includes erectile tissue, glands, muscles and ligaments, nerves, and blood vessels. In an embryo there is a small raised point that grows into a clitoris in girls or a penis in boys. Inside, the penis there is the urethra, but there is no urethra in the clitoris. In women, the urethra is hidden behind the clitoris and in front of the vagina. Penises with male urethras are used daily for urination, and can be used for sex: semen passes out of the body through the male urethra. 