hmmm, rather personal subject but one we all deal with. Good for you for bringing it up.
Have you tried pillows at various spots under your body? It may be lack of cupport that makes positions difficult. I spoke to my GP about and she was very helpful. I have been married 22 yrs and hubby is very understanding, and honestly never brings it up. He is wonderful. Just be patient and keep trying.
p.s..my Dr also said that the hormone rush afterwards is a natural pain reliever...lol