Which acid is present in human semen?

In the mammalian reproductive system,testicular degeneration and other diseases occur due to the deficiency of .......

How much lower is the temperature of the testes maintained by the scrotum compared to the body temperature?

Cauda epididymis leads to

The Leydig's cells secrete:

$A$ pair of bulbourethral glands, also called $...A...$ glands, are present on either side of the $...B...$. They secrete $...C...$ fluid and $...D...$ for lubricating the penis. Here $A, B, C$, and $D$ are: