[AndrewC]

Which of the two functions of your male genital organ do you exclusively use?

There is only one function that is needed for my physical survival.(emotional survival is not considered).

(Also remember the argument among the body parts as to which was the most important-- the sphincter won.)

[Right Wing Professor]

There is only one function that is needed for my physical survival.(emotional survival is not considered).

Both are needed for the survival of your genes, and as you recall, we are discussing evolution here.