Please note that the Catholics impose their idea of sexual morality on Catholics only. As long as membership is *voluntary*, this is completely compatible with AnCap, as far as I can see. (I realize there were some nasty periods of Church history where membership was not so voluntary.) Would you agree?
In a similar vein, you can attend Bob Jones University as an atheist or any other religion (and I know several atheists that have - there are some good programs there) - BUT you have to agree to abstain totally from alcohol, other drugs arbitrarily made illegal in the US, fornication, and a few other restrictions (as spelled out in your student contract) for the duration of your degree program. Most honest people are willing to to abstain for 2 to 4 years as part of their contract. This is compatible with AnCap, as it is a voluntary contract. Agree?
Agreed on both counts, so long as all the restrictions are voluntary, I see no problem in imposing them.
A "marriage" (ie specifically something that is called a marriage) typically, even in very homosexual-friendly societies, has been heterosexual and reproduction-oriented. However, there have been numerous other ceremonies over the ages which are not so specific.
The problem is that today, the concept of marriage has been tied up and wrapped into the ideas behind those other ceremonies. Worse, there's been a legal definition applied to that concept, when prior it was primarily up to the churches to decide what was "marriage" and what was not.
What we need to do is separate the ceremony from the legality.