Erectile dysfunction which is also called impotence is the inability to get or keep an erection . Most often caused for this condition is psychological due to anxiety , stress or tiredness. It can be treated with Viagra ( Sildenafil) which is now available after consultation with pharmacist. if not treated over time or by the medication , it is best to see a psychosexual health expert. With regards to infertility , sexual intercourse is needed to try naturally. Therefore if impotence is the cause of infertility , it is best to see a psychosexual health expert first before seeing a fertility specialist.