"I'm just as equally at fault here...I know I am, but I'm the one...with boobs, I'm young and firm and exciting...shouldn't he make an effort too??? Shouldn't he appreciate that??"

Yes, he should and why he isn't is the question. If he has lost interest there is a reason. Overtired, overweight, not enough time, not enough interest, drinking, drugs, another woman, something is not right and you haven't nailed it yet.
Maybe, a nice sit down talk, no accusations, no tears and no demands will get to the root.

Good Luck,