What role do the bulbourethral glands play in male reproduction?

The bulbourethral glands, also known as Cowper's glands, are crucial in male reproduction as they produce a clear, viscous fluid that serves as a lubricant during sexual arousal and intercourse. This fluid is released before ejaculation and helps to neutralize any acidity in the urethra and the environment of the female vagina, creating a more conducive atmosphere for sperm. By providing lubrication, this fluid aids in reducing friction during ejaculation, thereby enhancing the likelihood of successful sperm transport.

The other options do not accurately reflect the role of the bulbourethral glands. They do not regulate hormone production or store sperm, as those functions are carried out by other structures in the male reproductive system. Additionally, facilitating egg implantation is a function associated with female reproductive anatomy, particularly the uterus, and does not pertain to the role of the bulbourethral glands in males.