Sinuses do lighten the skull, but they also produce mucus to moisturize the inside of the nose. This mucus protects your nose from dust, dirt, micro-organisms and other harmful substances.
In males seminal vesicles and a prostate gland and paired of bulbourethral glands. secretion of these gland produces a plasmic seminal fluid which is rich in fructose ,calcium and certain enzyme the fluid is semen which increases basicity in vagina and decrease acidity.
