Sildenafil - does viagra affect fertility or the sperm fertilization capacity ?

I've looked into viagra several times for my husband who has sickle cell disease. This is a blood disorder that causes his white bloodcells to eat his red bloodcells. With low red bloodcells comes low circulation, and therefore lack of stimulation in certain parts of the body. Especially the genital area for both men and women, but in this case men. I'm here to tell you we have 6 kids all 14 months to 2 years apart ... LOL :) So viagra does not decrease your sperm count. I can make some suggestions: like I said earlier increased circulation increases stimulation. So take some natural circulatory meds ( all natural if preferred) . Also I know this sounds odd but statistics state that a man who masterbates atleast once a day has a larger sperm count. Its kinda like a breast feeding mother the more milk the baby drinks, the more the breast fill up. Were intended to populate so it makes perfect sense for sperm count to increase with more use of sex and/or masterbation. But no viagra does not increase or decrease sperm count, only your sex drive and firmness. Good luck on your new soon to be family. If u have any further questions please don't hesitate. Truly, Danielle1959