In theory, while I and probably every other man in existence would probably think a blowjob every morning is heaven, in practise it's probably not. Blowjobs are special, if I'm getting one every day then they're a little bit less special, especially if I suspect that I'm only getting them because my wife feels she has to to stop me wanking.
For me, wanking and sex are two completely different things (and I'm classing anything I do with my partner as sex here, even if it's a handjob)
Lets say wanking is a bowl of cornflakes, and sex is a Full English Breakfast. I love a fry up, it's one of my favourite ways to start the day. I do not love cornflakes, but they fill a hole and let me get on with my day.
So why don't I want a fry up every day? If I have one every day then it becomes less special, it's not a treat. It also takes longer to make and eat. I can also eat my cornflakes in the shower, saving time (I never said this was a good metaphor!)
Now lets really stretch the metaphor to breaking point. Lets say a blowjob is a fry up, but it's been made by my partner, and she's made it just for me, she's not having any herself. The first few times this happens, I'm going to be really appreciative, and then after a while I'm going to start feeling guilty that she's going to all this effort for me. That's fine, I'll make her a nice roast tonight to reciprocate.
But I don't want to make a roast every single night. I'd much rather we make a meal together a couple of times a week that we both really enjoy, and every once in a while I'll make her roast, and every so often she'll cook me my fry up as a treat. And on the other days I'll grab myself some cornflakes.
But I'm still getting a fry up every single morning, I'm beginning to think she's got a weird thing about me eating cornflakes in the shower.
(Clarification: a wank is not always cornflakes. Some really good porn, mood lighting, a fleshlight and some lube and you're at least up to Eggs Benedict. But a quick two minute hand shandy in the shower, definitely cornflakes)