Are men with spina bifida less fertile?

Maybe. It depends on the level of the spina bifida. Low lesions (sacral) can lead to loss of ejaculation. If the man is in a wheel chair, sperm quality can also be affected. Many treatment options are available with a male fertility specialist.
Delivery or content? Sperm production should not be affected by spina bifida. Erectile function on the other hand certainly can be affected by this condition.

Related Questions

I am a 31 year old man with spina bifida & I find the when I go to the restroom in the morning very little urine comes out of me. Is that normal?

Spinal Slowdown. This is not unusual in this type of condition since the nerves that control the bladder could be affected. In such a situation the ability to relax the bladder neck muscle effectively in coordination with the contraction of the bladder wall muscle to begin urination may be impaired. As a result the sensation to void could be affected as well as the ability to empty the bladder completely.
Experience teaches. You have lived with this problem 31 years. How long has this problem been occurring? If most of your life, then you have a "neurogenic bladder", common in spina bifida. But if this is new, consider inadequate fluid intake as cause of your problem. Sometimes an over-distended bladder will not relax readily after overnight sleep, perfectly normal.

Does spina bifida affect the size of a man's penis?

Sexual performance, yes, but a penile length of less than 2nd %ile for age would prompt a search for other causes. The higher the level of Spina Bifida, the greater the chance of erectile dysfunction & infertility. See: www. Ncbi. Nlm. Nih. Gov/m/pubmed/17767363/. Discuss treatment options with your urologist, if you are the patient. Improved sexual function & enjoyment is now possible for many men with SB.