First of all, I am not arguing marriage in any form.
Fair enough, but you’re missing the context of the Catholic teaching, then. Romantic love – and physical expressions of it – belong, in a Catholic context, in the institution of marriage. So, if you’re asking the question of ‘sex’, the Catholic response will necessarily be ‘marriage’.
The problem seems that people are playing the “procreate” card too easily.
That’s because that, once we identify that we’re in the context of marriage, the question arises, “what are the ends of marriage?”. One of these is procreation. If procreation is, by nature, impossible, then marriage cannot exist. (Note that this is quite different than procreation which by nature is possible but, due to medical conditions, might not take place.)
But I refuse to believe that straight married couples have sex only when they desire to procreate.
No one is saying this, and this is not the position of the Church, either. However, the Church
does say that licit marital relations
must always be open to the possibility of procreation and may not seek artificial means to block it. NFP is one example of a way to be open to the possibility of procreation. It also does nothing artificial to hinder it.
Thus, sexuality or sexual activities are not wholly constrained to childbirth.
True. But, they must also allow for the possibility of conception. Homosexual relations, by their very nature, cannot result in conception. That presents a
distinct problem, in the context of Catholic moral theology.
But the phrases I question in my original post seems to say that because two males or two females have the same bodies, no genuine affection or emotion of love can be produced
No, that’s not true, and we’ve demonstrated to you that this is not what that phrase means.
However, it
does mean that since there is no marital relationship, there can be no licit physical expression of sexuality.
But this is totally unacceptable to me for it subjugates the spirt to the physical; even by he merest physical touch.
Not ‘subjugation’. Rather, it shows the
unity of body and soul; we do not do things spiritually that do not affect us physically, and vice versa.