Demon film which scared me as a kid

I remember when I was kid I found a horror film vhs in a shop whilst on holiday in Wales. What I can remember - it had a demon white man, with horns on the front cover. On the back on the case I remember the image of the demon smiling, lying in a bed with his shirt off and a young woman sat at the foot of the bed, as if he is wanting her to join him. Thats , all i can remember.. It really freaked me out a lot as a kid, I was probably about 10 at the time, it's now 20 years later and that image is still in my mind! Any help would be really appreciated, thanks!