On the other hand, swallowing one's own semen is unsafe if a person has certain STIs. If it's semen (the liquid that carries the sperm from the penis) that a person is worried about, ingesting one's own semen is safe if that person is free of sexually transmitted infections (STIs).
When sperm is ingested by swallowing semen, the sperm will be broken down and absorbed into the bloodstream as if consuming water, milk, or gelatin.
