I SEEN THIS MOVIE ABOUT 4 YEARS AGO, BUT DON'T KNOW WHEN IT MIGHT HAVE
CAME OUT. ALL I CAN REMEMBER CLEARLY ABOUT THIS MOVIE WAS. A COUPLE
MOVES INTO HOUSE THAT IS HAUNTED. THE COUPLE ARE GHOST RESREARCHES FOR
SOME COLLEGE. THE LADY CAN TALK TO THIS GHOST USING SOME CAN OF GLASS
BALL.THERE WAS A FAMILT MURDER IN THE HOUSE, A WOMAN AND HER SON. EVER
TIME THE COUPLE WOULD HAVING SEX THE GHOST WOULD START MOVING THINGS
AROUND IN THE HOUSE. BASIC GOING AFTER THE MAN.AFTER THAT THEY FIND
OUT WHAT HAPPEN IN THE HOUSE . AND THE LITTLE BOY'S GHOST WAS TRYING
TO TELL THEM WHERE HIS BODY WAS. WHICH THEY FIND OUT THAT HIS IS UNDER
WATER TIED TO A ROCKING HORSE. THE BOY'S GHOST KILLS THE MAN THAT
KILLED HE.THE STORY IS SET IN BIG OLD HOUSE WRE THE PEOPLE SAY THEY
CAN HEAR THE SOUNDS OF THE WOMAN COMING FROM THE HOUSE...... I SAW
THIS MOVIE ON A RECORDER TAPE BUT DON'T IF YOU CAN BUY IT..

Hello.

I believe that your movie was "Knocking on Death's Door" (1998).

"Two paranormal scientists attempt to document the spirits which
reside at Hillside House. They track down the murderer of a little
boy, whose ghost is still alive."
source: ifilm.com
http://www.ifilm.com/ifilmdetail/2378073

This review mentions the detail that you remember about the ghost
moving things around when the couple is having sex.
 
"Brad Gallagher... and his newlywed wife, Danielle... are recruited by
Professor Paul Ballard (John Doe), who had a fling with Danielle
during her college days, to investigate paranormal happenings at the
legendary Sunset House (not Hillside House as the packaging states)...
the couple are tormented by constant intrusions on their lovemaking
(falling grandfather clocks, flying red-hot pokers, etc.)."
http://www.mondo-digital.com/deathsdoor.html

DVD from Amazon.com
http://www.amazon.com/exec/obidos/tg/detail/-/B00000IMCR/

-----
search strategy:
"boy's ghost" drowned movie
"knocking on death's door" ghost boy

I hope this is the movie that you had in mind. If not, please let me
know via the "request clarification" feature. Thanks.

very fast service. thanks!!!! never would have found it by myself

Thank you for the tip.
-juggler