What happens if a guy swallows his own sprem?

If a guy swallows his own sperm, it is generally considered safe, as sperm is composed of proteins, sugars, and other substances that are not harmful. The digestive system will break down the sperm just like any other protein. However, individual reactions may vary, and some might find the experience unappealing. It's important to maintain good hygiene and ensure that there are no sexually transmitted infections present.