I'm sure it has happened before, but it was probably 15-20 years ago. I don't believe that I ever intentionally did it on my birthday though... or the anniversary of my birth I should say. On my birthday I was being pulled out of a vagina. Most people only get to do that once.
It is not a better question. But yes, I did have sex on my last birthday. I was in Thailand at the time and picked up a girl who worked at a bar. No, not a prostitute, just a horny Thai girl longing for a white dick.