A Strange but true story (allegedly) emphasising the importance of
food hygiene.
 
A woman had been absent from college for a number of weeks. When she
returned one of her close friends was curious as to why she had been
sick for so long. The following story emerged.

The woman and her boyfriend enjoyed involving food in their foreplay
..mars bars, cream, syrup, gravy, peanut butter, you name it.  One day
the boyfriend, before going to work, made his sandwiches for the day:
tuna mayonnaise leaving the leftover tuna mayo lying out on the kitchen
top. He went to work, came home, had dinner and relaxes in for a night
in with his girlfriend. Time passes and the pair of them get in the mood
and start "doing the do".  The boyfriend leaps up, after yodelling in
the canyon for a while, and remembers the tuna mayo. He gets the tuna
mayo off the kitchen table begins to slap it all over his girlfriend's
body (applying voluminous amounts to her vaginal area) and starts to
lick it off. Two days later after their night of tuna mayo lust has
passed, the couple start to feel very ill. The boyfriend first , he
seems to be unable to stop vomiting and the girlfriend later who keeps
on getting severe stomach cramps. The boyfriend puts this down to eating
the tuna mayo that had been lying out uncovered all day, and sure enough
his jippy belly soon eases off after a day or so. His girlfriend,
however, continues to feel ill, her pain worsening and her abdominal
area becoming increasingly sore and tender.  This goes on for a few more
days until the girlfriend can't even get out of her bed for the pain in
her crotch and abdominal area.  So her boyfriend takes her to the
doctors, who recommends she a gynaecologist. Thinking she  may have
cervical cancer, the gynaecologist checks  her out and  to his horror
discovers far inside the woman's vagina is a swarm of maggots that have
been eating into her upper vaginal  cavity.

Apparently what happened was the tuna mayo, after being left uncovered,
in the sun, attracted a number of flies, who naturally laid their eggs,
which the boyfriend ate and the girlfriend "incubated"!