My other half works 12hour days 7days a week and somes evening work too, he quite often goes for over 3months with out a single day and is usually fast asleep on the sofa within minutes of getting home, im a full time mum and run a small (tiny) craft business from my kitchen, so between running around after a 2year old make painting threading beads etc we quite often dont have the time/energy/frame of mind to have sex. we were actualy discussing this not too long ago and have done the following-
In bed before you go to sleep, have a nice long kiss and a sroke of eachother, it doesn't have to be arousing, just appreciative, so you know you both still feel desirable and loved, some times you might find that from know where the kiss has got you ripping eachothers pj's off! but if not, it doesnt matter!
We are rather lucky in that my boy is very good in the mornings, and will quite happily play in his room with toys untill around 9am sometimes! only calling to us, if he's wet, so if the other half has a late start, or even better a day off, il quite happily leave him playing while i get him a cup of milk and make a cuppa for me n OH then get back in to bed for a morning quickie. Obviously at 1 maybe he's still in a cot? but it works for us. some people may be uncomfortable with this but i leave him to play in his room while i get a shower after breakfast most mornings.
There are various little things too, get a babysitter, maybe a family member? to come over once lil one has gone to bed, ask them if they would mind making packups for the next day too? go out, have a drink (vodka and redbull works a treat!) walk home!! hold hand, stop to kiss every now and then, its amazing what it does for us.
Does you boy have an afternoon nap still? Make use of the time at weekends if he does, yes you could use th time to catch up with the ironing but soon will be a day he wont nap any more, so you'll have to get used to it at some point, the time would be better used with a quickie
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i hope at least one of these is do able for you, if i think of some more il be back, and like some one else said, schedule sex is fine when your busy! and its fine to ask for sex too, you both might go in to it tired or grumpy but that soon dispears once you get going, you dont have to be jumping around the house doing it on every surface 