I'm not aware of a widely - known 'wife swallows story' in mainstream literature or common folklore. There might be some very specific regional or personal stories with this name, but nothing that comes to mind as globally famous.
This is a very risky behavior. In addition to the possible presence of sexually transmitted diseases, semen also has a composition that may not be suitable for ingestion. Our body's natural defense mechanisms are not designed to handle this in a way that is completely safe. Safe sex should always involve measures to prevent such potentially harmful contact.