Many aspects of human sexuality are very puzzling, take celibacy.

This can be a choice of life, or a condition imposed by environmental factors.

While attending a marriage encounter weekend, Robert and Mary listened to the instructor declare, `It is essential that husbands and wives know the things that are important to each other`.

He addressed the men, `Can you each name and describe your wife's favourite flower?

Robert leaned over, touched Mary's arm gently and whispered, `self-raising, isn't it?

Thus began Robert's life of celibacy