Ah, girlfriend, don't despair about your hubby's lack of romance and passion. Having no personal glimpse into your life, would guess your man has "adjusted" into being a responsible husband and father. He may no longer see the need to be romantic and passionate. You are supposed to see how much he loves you by the way he provides for you.
Being married, myself, to a man with no social skills, not a romantic bone in his body who had a penchant for saying absolutely the wrong thing,(good heart, hard worker, honest and no doubt he loves me) I've tried quite a number of solutions to get him to respond to my need for a little bit of romance and passion. Like you, nothing huge, nothing outlandish, just a little bit here and there.
Most men need to be schooled in the art of romance. It's not romantic being the teacher, but does eventually pay off. It takes repetition and patience. The first rule for you is to NEVER say anything negative about your own body or appearance. If what he hears from you is your worries about crow's feet, poochy belly, sagging this and that, you are conditioning him to see you in that light. Men do not know they are supposed to tell us we look fabulous when we constantly criticize ourselves. You must condition him to see you as the most beautiful and sexy girl in the world.
For instance, you haven't done anything to your hair yet, he's about to go out the door to work, the baby is fussy, the other two are up early and whining about their cereal being soggy. What does your husband see? Change his perspective. Be casual and sexy(I know that would be tough, here, but you can do it) in your "come hither" voice tell him your hair looks like you just finished having wild sex, sure would make for a cheerier morning if you had. Blow him a little kiss, run your hand through your hair and say maybe tomorrow........Then, go right back to mommy mode and deal with the early morning kid stuff. He may not act on this right away, but guarantee he won't forget it.
Point out to him how great your butt looks in those jeans, I don't care how you really think you look. Lean in close and tell him how great your freshly shampooed hair smells. Shower after the kids have gone to bed and walk in the living room wrapped in your towel with your body lotion, hike a leg and tell him you need help putting lotion on your legs. Be a little insistent, if necessary and don't get crabby if he's hesitant.
Make a list of phrases that you would like to hear and give it to him. Mark a day on the calendar each week that he has to say one of these to you. Don't laugh when he says it wrong, don't grump if he says it in monotone with a pained look on his face. This is hard for him. Reward the effort. Hug, kiss, flash him. Tell him that's a good start, a little more emotion next time, please. Getting the idea????
If you are of the opinion that it's amazing what's hidden under that housecoat, or sweats, convey that to him, pretty soon, he'll think that all the time. If you are of the opinion that it's life's great gift to be good wife to him, great mom to your kids and still the girl of his dreams and convey that to him, he'll be thinking that all the time.
You also must keep reality. You are at home, have loads of time to think of him. He's at work and has to focus on work. Leave off the calls to his workplace to tell him you are thinking of him. Those are usually counterproductive. Most men need some space and the workplace is not a space we should invade. Instead, tell him when he gets home that you thought of him a hundred times through the day. You envisioned him handling whatever tasks are involved with his job. How happy it makes you that he can go from being tough guy/ business man to great dad/sexy man. He may be feeling you are calling him for self affirmation. Take that burden off him.
As much as we may hate it, we have to tell them what we need. We do have to school them, we do have to be properly vocal and repetitive and reward all their efforts. And be PATIENT. It's tough for a man to really realize they "ain't all that" in the romance department. You have to make it a challenge they can live up to. Present it as you are realizing the full potential of your body and mind and the rewards and pleasures contained within.
Hope this helps. Good luck.