I'm another where it's in the contact order to meet new partners before contact with child. Lawyer told me it'd never been done and judge would say no. Judge agreed (given all that had gone on before).
Why? Because this person will be spending a LOT of time with my child in a quasi parental role. Establishing a good relationship with your child's step parent ESPECIALLY when the relationship with the other parent is difficult can really help the child.
In my case he was leaving her with new lady in sole charge having neglected to tell her that our child had asthma and allergies! Not only dangerous for child but bloody unfair on her! I was also able to have a good chat with her re dds likes/dislikes, routine etc and that enabled her actually to build a good relationship with her.
"I would want the new girlfriend to feel comfortable enough to let me know if there were any problems or whatever" another good reason. Ex was a bugger for telling me sod all! Whereas dds stepmum (especially once she was a mum herself) would say things at collecting time like "she might be a bit grumpy she didn't sleep well last night" or "grab some calpol if you've none in she's starting a cold and may get a fever" (dd was prone to VERY high fevers at the slightest bug resulting in fits at one stage - ex REFUSED to acknowledge this)
As a helpful "side effect" it also meant I was able to debunk all the crap he'd told her about me! (Crazy ex, wanted him back - par for the course - BUT Inc that I'd threatened her!)
So there's lots of good reasons. I think it should be standard behaviour.
"I've never understood why exs have this compulsion to force their new girlfriend on their children, when they're seeing their children only one day a week, or for a few hours. Why can't they just be there for the child, rather than making it all about them?" It's to impress them. "See what a good dad I am. I must therefore be a lovely all round broke and not a cocklodging/cheating/abusive pos"
Also so they have a babysitter for nights out with the lads if they're "stuck" with the child at weekends. And if the child is very young - so they're not having to do nappy changing, night wakings etc
The kissing on the mouth DEEPLY inappropriate NOT British culture that's bullshit! Geez wasn't that long ago we barely shook children's hands! 😂
What's wrong with mum feeling better? Surely that then means mum is relaxed which then means child is more relaxed. Children pick up on parents emotions.