Tubal ligation of the woman: IVF. Vasectomy of the man: after vasectomy semen production continues, however, the sperm cannot leave the testicles. Therefore, it is possible to extract living sperm cells in a small biopsy from the testicles. This procedure is called TESE (TEsticular Sperm Extraction). After sperm recovery, a single sperm cell is injected into each oocyte to enable fertilisation. The procedure requires that the woman must have IVF in order to recover the oocytes.