Not necessarily. Occasionally a little blood will find its way into the semen – the same way every once in a while you can have a nosebleed for no reason at all. If there's a lot of blood, or if it's happening again and again, you should probably check with a doctor. (For more, read JackinQ&A – Questions About Semen & Ejaculation.)
Do you find yourself masturbating more often during some seasons than others? Why?
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