Secretions of which of the following glands help lubrication of penis?
Prostate
Bulbourethral
Seminal vesicles
All of the above
Accessory sex glands in males consists of a pair of seminal vesicles, a prostate and pair of bulbourethral glands.
These glands release their secretions to form seminal plasma that is rich in fructose, calcium and few enzymes.
Bulbourethral gland releases it's secretions that help frictionless movement of penis during sexual intercourse.
Hence option B is correct.