Women and men both. In couples trying to conceive there is a sperm issue about 40-50% of the time, ranging from mild to severe sperm problems. Semen analysis is an important part of infertility testing. Sometimes the sperm issue is the only problem we find when we test both partners, often there are male and female factors together. Even if the man's sperm is 'normal' it helps a lot if the male partner is supportive!
A couple's. Trying to conceive involves both partners as it involves the egg and sperm. Thus, an evaluation of both partner's is necessary to diagnose and determine the best treatment for infertility.