Is it unreasonable for me to tell my husband not to fart in bed?

My husband always farts in my presence and I HATE IT. Nothing grosses me out more than farts, they seriously make me want to throw up. He always farts in front of me, and he especially farts in bed, EVERY MORNING. I really do think he is capable of excusing himself to the bathroom when he needs to fart, but he won't do it. I think farting in the bed is really rude and inconsiderate towards me, and it makes the sheets stink. Our bed is supposed to be a beautiful comfortable haven, and when he farts in it I just think that's wrong! What can I do to get him to STOP FARTING in our bed and in front of me all the time!!??