May I be nosy and ask what your husband is doing while you are getting supper, cleaning up, doing homework and tucking kids in ? This is WAY too much for one person when there are 2 parents.
Let your husband know that you miss him, too. That you get tired at work, and you need some help with the kids. One of you make supper, the other does the dishes, or helps clean up. Then you take turns putting the kids to bed, or you divide and conquer. This will help him to be more involved with the kids, and you will both benefit from that.
In addition, the 17 month old could move to the crib -- at least for the first part of the night. If she wakes up during the night, bring her to your bed at that time. This will give you time to talk with each other, and to cuddle up in bed, as well as time to make love.
I saw this thing on tv this a.m., where this pastor out west somewhere told the married people in his church to take one week and have sex every night. I thought it was pretty funny, cuz when my husband and I were younger, we sure didn't need anyone telling us to do that ! It was routine. Anyway, they interviewed 4 couples on day 6 of the sex edict, and they all noted that planning to make love and setting the time aside to do so has brought them into better communication, and revitalized their marriages.
Life gets busy, and we get tired. We then forget that the most important relationship in the family is the one between mom and dad. Find ways to show your husband that you care about him. If he wonders about affairs, ask yourself why ? Frankly, I can't imagine that you'd have time for one, between work and kids, but time isn't the appropriate answer. Let him know you love him, thank him for sharing the family chores (even if he doesn't thank you for doing them) and let him know you appreciate him.
Also, if you need a little relaxation time before bedtime, let him know. Give yourself 15 minutes on the couch to unwind, then get ready for bed, so you are more relaxed when you enter the bedroom. But don't shut him out because you are stressed. Sometimes it's wonderful at night, to cuddle up to your spouse, dump your frustrations and get a good backrub for your efforts.
Good luck ! It's really hard to juggle everything, esp when the kids are little, but it's important to keep your relationship with your husband #1. That's the best way to keep the family intact and to have the kids feel that their home is a happy and healthy one.