First of all, it’s an explanation of canon 916
Can. 916 A person who is conscious of grave sin is not to celebrate Mass or receive the body of the Lord without previous sacramental confession unless there is a grave reason and there is no opportunity to confess; in this case the person is to remember the obligation to make an act of perfect contrition which includes the resolution of confessing as soon as possible.
vatican.va/archive/ENG1104/__P39.HTM
The canon mentions 2 conditions
- “there is grave reason” to receive Communion
- “no opportunity to confess” beforehand
The canon states that both conditions must be met. In other words, this is not “either…or” but “both…and.”
The explanation (#1111) offers some insight on what constitutes “grave reason to receive” and what constitutes “no opportunity to confess”
One obvious reason (for a “grave reason” to receive") is danger-of-death.
Keep in mind that condition #1 requires a “grave reason” to receive Communion. This is a very high standard in canon law. Being embarrassed about not-receiving might be a “reason” but it would have to be a very embarrassing situation indeed to constitute a “grave reason.”
To continue along the direction that the conversation is already going here…
Embarrassment about not-receiving the Eucharist is not itself reason to receive Communion. That’s because only one of the 2 conditions has been met. A person who cannot abstain from Communion without embarrassment cannot (note the negative) receive if there is an opportunity to go to Confession.
Now let’s look at the second condition; no opportunity for confession.
The comments (again that’s #1111) offers insight into what would cause a person to have no opportunity to go to confession; and gives some examples.
One obvious example is the lack of a confessor (ie priest who has the faculties to hear confessions). This can happen in many different ways. In rare circumstances, a priest might have faculties to celebrate Mass, but lack the faculties to hear Confessions. It might be a mission situation where a deacon is conducting a Sunday Celebration in the Absence of a Priest—here, Communion is available, but Confession is not. There are many other possible scenarios where one might be in a position to have the availability of Communion, but not the availability of Confession.
It’s not a simple matter of saying “if there’s a priest to say Mass (or there is opportunity for Communion) then there must necessarily be a priest to hear Confession” even though many readers might have that as a first impression.
Another example given is that the person personally knows the only available confessor-priest but cannot confess to him without embarrassment. For example:
Small parish. The person is a close relative of the priest (the only priest available) but needs to confess some embarrassing sin against the 6th commandment. In such a situation, the 2nd condition would be met (at least according to the interpretation).
Keep in mind, folks, that in canon 916, both conditions must be present.
The commentary is simply giving some explanation and examples of what might constitute the necessary conditions presented in canon 916.