Ok I am going to ask something, in your first post you said that if he goes without sex for 48 hours he gets cold, does that make you feel in order to make him happy that you HAVE to have sex with him? Just a question because what I have found in most relationships when sex seems to be more of a chore than something to show someone how much you love and care for them or to be close to them then it loses its spark so to speak you become less interested and frustrated and maybe start to feel a little bit used.
Ask him to do little things for you, what made sex great at the start of the relationship? Maybe think back to those times as well and discuss if something he done during sex then and maybe your missing now, romance excitement, usually gets missed when a relationship gets more secure as well, things he may of done in bed to start with to seal the deal so to speak are maybe missing now as well?
Sex can be a real great thing or often it can be a relationship killer, you maybe do need some help to deal with an overly frigid mother, if you had alot of bad things drummed in about sex then its not going to go away over night you probably need help with this.