this can actually happen
If we examine the common causes of why one would have worms, we find this: 1) eating sushi or improperly cooked meats will cause worms; 2) eating vegetables or fruits not properly washed could also cause worms if they are exposed to fecal matter, even in tiny amounts. 3) sexual practices which involve the rectal area and involve contacting feces can also pass worms.
If your interested read the entire article at
http://www.health-truth.com/articles/parasites05.asp