No, in principle a varicocele does not affect erection. Only if testosterone levels drop dramatically, the man may experience erectile dysfunction, but it is uncommon.
Read the full article on: What is a Varicocele? – Causes, Symptoms & Treatment ( 53).
Degree in Human Biology (Biochemistry) from the Pompeu Fabra University (UPF). Official Master's Degree in Clinical Analysis Laboratory from the UPF and Master’s Degree about the Theoretical Basis and Laboratory Procedures in Assisted Reproduction from the University of Valencia (UV).