The only way to definitively know about fertility potential is with a semen analysis. The majority of men with infertility will be asymptomatic, other than having difficulty conceiving with a partner. If 12 months goes by without success (or 6 months if your partner is over 35), a man should be checked with a semen analysis. Despite most being completely asymptomatic, some infertile men will have symptoms such as problems with their libido or sex drive, erections, or ejaculation. Particularly if symptoms of sexual dysfunction are new or worsen over time, there could be an associated fertility problem. Most men will not be able to know their fertility status until they do a semen analysis.