I am astonished that you think any of those things make the slightest bit of difference if you are shacked up with a coercive arsehole!
full and thorough discussion about likes and boundaries in advance of sex
'Where are her boundaries? Which can I push now? Which can I not yet push? Which boundaries do I need to push first in order to push those other boundaries later?'
I don't think you understand how controlling relationships work. Women who end up in them do not agree on day one to give him complete access and control of her phone, to have to account for every minute she's not with him, to stop seeing all her family and friends, to change her appearance, weight, exercise regime, to have sex when he says, have a child when he says, have an abortion when he says ... their boundaries are chipped away at slowly, imperceptibly, until they realise they have sleep-walked into hell.
How much easier if the first stage is all laid out neatly and you've had an in-depth discussion so you have a good idea which boundaries are hard limits (for now), and which can be pushed first?
have a follow up afterwards about how it went
Oh yeah, the trauma bonding bit or 'aftercare' is essential
In other contexts this is called the honeymoon stage of the abuse cycle.
And then people around them have conversations like this:
'Did you see what he just did? Why is he treating her so badly?'
'Oh, it's fine, they've got a D/s thing going on.'
'Oh, OK then.'
Perfect cover.