What is the source of objections to Catholic sexual morality?

We find our starting point in the plausible assertion that modern man would find it difficult to relate to the Church’s traditional sexual morality. Instead, it is said, he has come to terms with his sexuality in a differentiated and less confining way and thus urges a revision of standards which are no longer acceptable in the present circumstances, no matter how meaningful they may have been under past historical conditions. The next step, then, consists in showing how we today have finally discovered our rights and the freedom of our conscience and how we are no longer prepared to subordinate it to some external authority. Furthermore, it is now time that the fundamental relationship between man and woman be reordered, that outmoded role expectations be overturned and that complete equality of opportunity be accorded women on all levels and in all fields. The fact that the Church, as the particularly conservative institution that she is, might not go along with this line of thinking would certainly not be surprising. If the Church, however, would wish to promote human freedom, then, ultimately, she will be obliged to set aside the theological justification of old social taboos, and the most timely and vital sign of such a desire at the present moment would be her consent to the ordination of women to the priesthood.
The roots of this opposition continue to emerge in various forms and make it clear that what we are dealing with in our imaginary but quite pointed litany is nothing less than a very coherent reorientation.

Its key concepts present themselves in the words “conscience” and “freedom,” which are supposed to confer the aura of morality upon changed norms of behavior that at first glance would be plainly labelled as a surrender of moral integrity, the simplifications of a lax conscience.

No longer is conscience understood as that knowledge which derives from a higher form of knowing. It is instead the individual’s self-determination which may not be directed by someone else, a determination by which each person decides for himself what is moral in a given situation.

The concept “norm” – or what is even worse, the moral law itself – takes on negative shades of dark intensity: an external rule may supply models for direction, but it can in no case serve as the ultimate arbiter of one’s obligation. Where such thinking holds sway, the relationship of man to his body necessarily changes too. This change is described as a liberation, when compared to the relationship obtaining until now, like an opening up to a freedom long unknown. The body then comes to be considered as a possession which a person can make use of in whatever way seems to him most helpful in attaining “quality of life.” The body is something that one has and that one uses. No longer does man expect to receive a message from his bodiliness as to who he is and what he should do, but definitely, on the basis of his reasonable deliberations and with complete independence, he expects to do with it as he wishes. In consequence, there is indeed no difference whether the body be of the masculine or the feminine sex, the body no longer expresses being at all, on the contrary, it has become a piece of property. It may be that man’s temptation has always lain in the direction of such control and the exploitation of goods. At its roots, however, this way of thinking first became an actual possibility through the fundamental separation – not a theoretical but a practical and constantly practiced separation – of sexuality and procreation. – from Difficulties Confronting the Faith in Europe Today (Communio, Winter 2011)