I've always said that if they showed sex what it is really like on film and tv, no one would ever have it. There is never a wet spot, no one ever says "ouch, you are on my hair," no one ever gets a cramp, the man never puts it in the wrong place. No one ever says "that was a bit shit, wasn't it?"
(In all honesty, SATC had some of the more realistic sex scenes and even they could be far fetched most times)
Don't get me started on childbirth as portrayed in soaps. It's always waters breaking in dramatic fashion and then the baby is born 10 seconRAB later while the woman lays flat on her back.