You often find yourself in a predicament: a wonderful opportunity presents itself, but it is a “sin” to “give in” and do it. There may be many things operating here, not the least of which is this thing you refer to as your conscience. Not to be confused with conscious, a conscience is not something you have to strive for or work on, it arrives—quite naturally—due to the socialization process inherent in all societies. Unless you were one of those rare individuals who were raised by wolves, grew up in an isolated locale with uncaring parents or suffered from a cognitive disorder, you have a conscience.
And though your societies, as well as the individuals that comprise them, are changing drastically, few of you can—or will ever—“escape” this attribute. There’s nothing “wrong” with having a conscience, of course, how you act on this is completely up to you. Which brings us back to this topic of sin. Wherever conscience is a reflection of growing up in a particular society, you will have this paired concept of sin.
Sin has its origins in morality and so does conscience. Living with others with minimal conflict has traditionally required a moral code—barometer, if you will—against which you monitor your own and others behaviors in any given situation. The moral codes may change over time and with various cultures or societies, but that process is slow relative to other changes. Creating this concept of sin has aided in the overall reduction in what you call crimes, up to recent times, when this trend has begun to reverse itself (this is a different topic of discussion). Also, traditionally, your religious institutions have been the ones which held the most sway—the criminal systems you erect around these sins are merely the enforcement mechanisms.
We have told you that there is no “sin.” Of course, this is not a statement of negation against your experience as it now is. It is a universal statement which is meant to point you in the direction of self-governance. Without a formalized idea of sin, you are the only one to restrict or apply actions, behaviors or other social interactions—the word “intercourse” fits this nicely, but it has been subjectively loaded with meanings connected with sex. Actually, a conversation is no less intercourse as it is an explicit act of “love-making.” To further complicate this, there are still societies on your planet where “intercourse” of the spoken kind could be consider a “sin” if the participants are not “supposed” to interact with each other. For instance, in some Muslim cultures, an unmarried woman cannot speak with a man without a chaperone—though this tends to be one of the exceptions. However, it does nicely illustrate the complexities of morality and sin.