I can't believe how many people are saying it's fine!!
I have seen this on MN before. So many people seem happy that a much older man is in a sexual relationship with a much younger girl - and yes, a 17y is pretty much still girl.
They are still not much more that children at that age. They are not generally that mature - they look it, and can often talk the talk, but it doesn't take very long in their company to realise that actually, yes, they are just a 17y teenager really.
It horrid and there is a clear issue with the balance of power.
A 17 year old who had a secure childhood and has firm boundaries would be able to handle it and not allow themselves to be in a controlling relationship.
Not at 17y. But then ime most 17y with those secure childhoods with firm boundaries wouldn't be dating a 29y man, and their parents - who would still have some level of boundaries and control over their 17y child who lives in their home with them - would be having something to say about it too.
A 29y man should have very little in common with a 17y teenage girl. They SHOULD be at entirely different stages of life.
You really have to question why a 29y is wanting to be with a girl of 17y and not someone nearer his own age.
And a 12y age gap is hugely different if they're both a decade older. But when one of them is just 17y it is just wrong.