I have two sex partners, both of whom I have oral sex with. Can swallowing a man's semen on a regular basis be harmful? I know having two sex partners is not good, and I'm getting ready to let one go, but the one I'm going to continue a relationship with likes for me to swallow. Is this harmful if I swallow often?

Well, let's see. If you're swallowing, your partners are obviously not wearing condoms, which means you're risking exposure to any sexually transmitted disease they may have. Viral STDs, such as HIV or hepatitis C, are more easily transmitted this way because the virus can penetrate the esophagus more easily. Assuming your partners have been tested for HIV and other STDs, there is no real harm in swallowing semen.
And, in spite of what you might hear about the nutritional value of semen, it's not high in calories. Besides the 200 to 500 million sperm in the average male ejaculate, semen is made up of sugar, water, enzymes, protein, zinc and citric and ascorbic acid (a.k.a. vitamin C), but there's not enough of anything to cause any harm or good, for that matter.
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