Can the government compel you to provide someone a service against your will?

[Beskar]

I personally disagree with that view of technical grounds, but I lost the argument because nobody else on either side was interested in the technical question. So now I'm not allowed to air my views in public, or to act upon them.

Mostly due to the technical definition you give in no longer valid in society, it is out of touch with modern reality. Marriage is not seen as something as the sole purpose of reproduction, marriage is seen as a commitment between two people who love each-other. The whole children part is counted separately. In this, whether is it man, women, either, in combination, it is simply two people loving each other. Parenting is separate, it can occur before and after marriage, especially as there are many options such as fostering/adopting which doesn't require the two people involved to put the bun in the oven.