Awareness happens only in contrast. That's why in the night you can see the stars in the sky, not in the day. In the day there is no contrast; the sunlight is so much, you cannot see the stars in the day. But in the night, when the sun is gone and all is dark, stars start appearing. What happens? The contrast of darkness is needed for them to appear, just as you write with white chalk on a blackboard.
If you move deeply into life, love, sex, suddenly you will become aware of death surrounding you from everywhere. That's why man became afraid of sex and religions became repressive of sex. It is not just an invention of some theologians; there is some deep psychological reason for it. Man became aware of one thing: that whenever you move to the peak of love, suddenly you become aware of the deep, deep, abysmal valley surrounding it. And fear takes grip of you, you start feeling nauseous, shaky; trembling arises in you. How to avoid this trembling? The only way that was found was to avoid the peak, so that you never come across the valley – avoid sex, so you never become aware of death.
You will be surprised to know that it is really death that has made people afraid of sex. And all the people who are afraid of sex are cowards, naturally. It has to be so. It is because of the fear of death that they have become inhibitive of sex; hence they are cowards.