I'm not sure I see the benefit. If someone has never been married, that assertion and the evidence supporting it should be discussed in the narrative bio. If it is, then others reading the profile will be aware of it and, if they find the evidence convincing, not bother searching for a spouse. If the evidence is not discussed in the narrative bio or the evidence is not convincing, then it makes sense for others to research the issue, regardless of whether a "never married" checkbox is checked. The key is the discussion/evidence in the narrative bio, not a checkbox.