Apologies in advance for a post that will go on and on... I'm not great at fewer words...
I feel for both sides, but his behavior needs to change some for things to be better.
Its completely natural and healthy that he wants to satisfy you in bed. There's a lot of threads here where women write in with lovers who are uninterested in sex and uninterested in getting their lover to orgasm. The relationship feels more like "roommates" when it becomes more asexual... and everybody wants to feel chased. "consenting" to sex just isn't sexy. My partner is exhausted at night... she's "willing" to have sex if I initiate and pursue it, but I rarely do... I don't want someone who is just glad to help me out, give me a fix. I'm fine waiting until the morning when I can get a better emotional connection to her. Not to say I never pursue her at night.
So there's the guilt trip you face. Men are told to be lovers. Told to be giving in bed. And the primal "porn star" in him tells him if he can't get you off, that he's less of a man or doing it wrong. So... his position is understandable.
And then again... you are in a bad position. 5 kids... how much time do you have for romance? Sensually connecting? Uninhibited, spontaneous, playful touching? Little to none, right?
You need to try to talk to him without it being a fight. Both sides feel like crap here. Sounds to me you are willing to compromise by having sex when you are less intereted, but in return you are getting guilt trips because you aren't reaching the big "O". Not going to work.
As mentioned already, stress can kill libido. Guilt on top of stress is just more noise thrown into this bad cycle. It just feeds and propagates itself.
Do you ever make arrangements for you to be with him alone, no kids? Take a night out at a local hotel after dinner and a date? Mentally and physcally getting out of dodge can help you relax and recharge. My partner and I try to do this once a quarter.
Next... how is your mental and physical health, outside of being tired from fam life? Depression kills libido, being in better health primes it, drugs, smoking, drinking can all hurt libido. There's a lot of reasons you might be in a "rut"... and if you are uninterested, you are less likely to enjoy it when you do have sex.
When you are interested, are you satisfied? Is sex pleasurable? Can he get you off? Does he ever try oral first to pleasure you first, and then himself after through intercourse?
I know... lots of questions. Have you read any books on sex, sensual touching, etc? Its an interesting way to piqué your interest, and perhaps then show your partner a section that might be fun to try.
So... issues are real on both sides. If he wants to get you off, why not focus on your first? Personally, this is how I approach sex proabably 80% of the time... I just know my partner enjoys sex more if I get her off orally, and then we move toward intercourse... she might get "seconds", has a good experience, and is primed for me. Also, do you ever self stimulate during sex? There are positions that would never work for my wife if she didn't self stim to orgasm.
Next, when you do try to connect, can you find ways to make the environment better for you to relax? Date night and overnights can help, but take planning and work. I recently posted in a thread what my partner would prefer to nearly guarantee orgasm...
https://www.askmehelpdesk.com/adult-...tml#post906239
Again, this is best case scenario, with no hassles or kids... and it takes deliberate planning and work. So... is there "work" he needs to focus on, such as sensual touch, to help you be in a better place?
I know your OP almost had an angle of wanting to find a way to make him accept that you aren't always going to get there sexually. He is missing the point, by not enjoying the sexual experience, orgasm or not. So... maybe you can find some in between ground... he needs to understand how pressures kill libido and how mental distractions can prevent orgasms... and maybe you can find ways to make sex more interesting to you and rediscover that connection. Some of the best "sex books" I've read weren't tantric... they were books about massage, touch, developing sensual tension.