Which of the following secretions helps in the lubrication of the penis?

Given below are two statements:
Statement-$I$: The scrotum helps in maintaining the low temperature of the testes.
Statement-$II$: Low temperature,compared to the normal internal body temperature,is necessary for spermatogenesis.
In the light of the above statements,choose the most appropriate answer from the options given below.

The histological layers of the testis from outside to inside are:

If the Cowper's gland (bulbourethral gland) is removed,which of the following will be affected?

$A$: Failure of testes to descend into the scrotum causes sterility in man. $R$: Higher internal body temperature is not suitable for sperm development.

If the testes of a male rabbit do not descend from the abdominal cavity into the scrotal sac,then .......