3 months postpartum and still no sex?

I understood when i was pregnant. It was awkward for him, that's cool. Now that I'm 3 months postpartum my husband still doesn't want to have sex with me. After a lot of hard work and dieting I have already lost all of the baby weight. Of course there is still a little excess skin because, after all, I was just holding a 9 lb. 15oz baby in my stomach. I'm no longer breastfeeding, and I have all sorts of energy! I did have postpartum depression for a short time but I spoke with my doctor and got counseling, needless to say I feel amazing and am happier with my body than I was before I got pregnant. The only thing wrong in my life is that I feel neglected. Things are different -down there- i'm sure but, he hasn't even tried to find out. I cook special dinners, wear special pjs and even try to initiate things but he always say no. Could he be suffering from low T (low testosterone) or do you think it really is me?