[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.

[AndrewC]

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

Nope. "My" genes are in my family. If I am around to whup things, "my" genes tend to survive. If I am not around to whup things, "my" genes tend not to survive. The ability to excrete toxins is a necessity for survival sexual reproduction is not.