Sorry to hear that.
But let me just say a few words...
They are insecure and inexperienced (yes, even M).
That's why they wanna make sure everything is okay with the other one.
They're still in an early stage of their relationship.
Once they're more confident it's
possible, the "repetitive" talk you're talking about, is going to be less present, but that's just something
I'm guessing, though.
The choice of words by S
Well, that's just something linked to S' personality.
She does not like words like
"pussy" for example.
They even talked about that if I remember right.
Getting old, my memory is not the best anymore.
Words like "tummy", "bum", "tushy" fit her personality in my opinion, but other's might get a bit turned off by those.
Which is fine, since we're all individuals after all.
Maybe that's also something that's going to change in the future, but again,
just guessing.
I like it the way it is, you don't, that's totally fine.
Maybe it'll change in your favour, maybe it won't... Only time can tell, though.
I hope you'll keep an eye on RiA regardless.
Maybe, just maybe, you're going to get lucky in the future.