A while ago, I answered a question about a woman who was dating a guy who lost both of his testicles in a car accident. It wasn't clear if this man could have an erection or an orgasm, but that post brought up many questions about orgasms and how it's possible to have one if you don't have any semen.

Here's the deal. Some men have what's called a dry orgasm. This means that they can have an erection, but when they climax, no semen gets ejaculated out of the penis. There can be several causes of dry orgasms:

• Surgical removal or damage to the testicles, bladder, or prostate.
• Radiation therapy directed at the pelvic area (such as for treatment of prostrate cancer).

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• Another cause could be something called retrograde ejaculation. Instead of semen coming out of the penis, it gets forced into the bladder when he climaxes. Diabetes or injury to the bladder could cause this condition.

Dry orgasms usually don't present any health problems, but they could prevent a man from being able to father children. The good news is that it's possible to extract sperm from the man and use it to artificially inseminate a woman.

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