I would suggest at least trying marriage councelling. You have children together. Give it a chance at least.
Your sex drive levels don't match up, yeah that can be a problem, but perhaps marriage councelling might help with that and get the relationship back on track again. They might give advice on how you can spice things up and get your wife 'tickled' and 'in the mood'.
Marriage councelling probably isn't going to be the same as the psychologist sessions you've had in the past.
It sounds like this is all about 'you', if I'm not mistaken. You're not getting pleasured, and your wife is preoccupied with your children. No matter their age, a mothers job is just simply something others can't properly understand and experience.
Depending on their age, maybe get a baby sitter, or if they're older, get them to join some clubs, after school clubs etc. so you and your wife have more time to have together. Go on dates. See if that will help.
If your children are adults, perhaps you can ask your children to house-sit whilst you and your wife have a weekend together.
If none of that sounds good and you still want a divorce, then I can only say I hope you'll all be happy 
_________________
Your Aspie score: 187 of 200
Your neurotypical (non-autistic) score: 25 of 200
AQ: 43
Empathy Quotient: 8
I have ASD, ADHD, Hypermobility Syndrome.