Men have different preferences than women. SecretKinksters is exactly right. You need to have an open and honest conversation with him and find out what changed. If he simply doesn’t enjoy it anymore then you should not push him into it, pardon the pun. It’s just as wrong for you to pressure as it would be for him to pressure you to do something you didn’t want/like.
Personally, I would say avoid any advice that encourages treating him as a piece of meat. Just because he may not like something you do is no reason to kick him to the curb.