Many aspects of human sexuality are very puzzling. Take celibacy.
This can be a choice, or a condition imposed by environmental factors.
While attending a Marriage Awareness 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 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.