There are several causes for burning semen, including allergic reactions and sexually transmitted diseases (STDs). Allergic reactions can affect a man and his own semen, or his female partner. Also, there are less common causes of burning semen, including irritation of the penis due to injury.
When semen is burned as a result of semen touching an area of skin, this is known as a semen plasma allergy. It can cause symptoms similar to any other allergic reaction, such as burning or redness. It used to be thought that men could not be allergic to their own semen, but this has been disproved. In some cases, a man may feel burning or irritation after ejaculation. A man's sexual partner may also be allergic to his semen, or all of it.
An allergy to semen protein is relatively rare, although it is not unheard of. Treatments may be similar to other allergy treatments and are aimed at reducing irritation and discomfort. Women who have a reaction to their partner's semen should try to avoid contact with it by using condoms.
Another type of burning semen is a burning sensation directly after or even during ejaculation. This is usually caused by some form of irritation to the urethra or the head of the penis. Many times this irritation is caused by an STD, other STD symptoms are also present. These may include unusual discharge from the penis, blisters, redness, painful urination, and a bad odor. Trichomonasis is one of the most common sexually transmitted diseases that can be related to semen burning.
Most STDs can be treated when caught early. Treatment may include medications and abstinence from sexual intercourse until treatment is complete. You can be reinfected with most sexually transmitted infections. Condoms should be used by anyone who is not in a committed, monogamous relationship.
Occasionally, a burning sensation with ejaculation can be caused by irritation or injury to the penis. Although irritation is also a factor in STD pain, urinary tract infections or even yeast infections can sometimes affect both men and women. Medical treatment is usually needed to get rid of the infection. Injuries to the penis can also cause pain or burning during ejaculation, although the pain is usually more constant and obvious if the penis has been injured.