Welcome to my world...sorry, just had to say that I too am married to an LD man, we have a 16-mo old S and have been together for nearly 2.5 years.
My H and I went for a year without having S during & after my pregnancy...which, lets just say it, SUCKED! It's as if the thought never crossed his mind. Prior to that we rarely had S either, but there were extenuating circumstances that made the behavior easy for me to excuse.
Let me ask you a few questions... 1. What's going on in your H's life right now...work, family etc. 2. What is his family like, how was he raised..mom, dad etc. 3. Has your behavior changed in any way? Be honest, are you asking for sex more, being more overt? etc.
FYI, don't give up. I have a hunch, and I believe others will chime in here with me, there's something going on within your H. I know there definitely is/was with mine...but just so you know, we're making progress. It's slow progress, a bit painful at times, and a hell of a lot of work, but definitely worth it.