From a traditional Jain perspective, a marriage between two men would not be recognized as a standard Jain marriage, because Jain household life historically understands marriage in the conventional man-woman form.

However, Jain ethics strongly value self-restraint, purity of conduct, and non-harm. So if there is no sexual contact, the main concern of brahmacharya in the sense of avoiding sexual indulgence is not being violated.

So the simplest Jain answer is:

• As a marriage, it is not traditionally accepted in Jain dharma.
• As a relationship with no sexual activity, it does not involve the same sexual fault that Jainism warns against.
• The final moral judgment in Jainism depends on intent, restraint, conduct, and non-attachment.

If you want the answer in terms of Digambar or Shwetambar understanding, I can give that too.