Men who have had a vasectomy might believe that they can no longer have children. While this is generally true, men who change their mind can still have children by having their vasectomy reversed. However, there are many reasons for why men might choose not to have their vasectomy reversed. For example, they might want a vasectomy in the long run and may wish to have only one more child. Under these circumstances, another option that the man has available to him is sperm harvesting.
There are also some men who ejaculate, but do not have sperm present in the ejaculation. They may wish to have their sperm harvested, but not all hospitals perform this procedure. For this reason, they might participate in medical tourism and have their sperm harvested.