I think some people here forget she is an exhibitionist, the more she exposes herself to others the more she gets off on it, her kink is exhibitionism, his kink is 'hot wife'.
The kiss in the park was more Nate taking advantage than her willingly kissing him properly, she liked it because it wasn't totally 'non-consensual' and she's a bit too trusting and a sucker for a hard luck story. The only fault here is her naivety.
Again the web meeting, she's been threaten about losing her job, so she's been put under pressure from her boss to get results, Luke tells her to do what she feels she needs to do even if that means using her 'charms', she decides to show a bit of skin, unfortunately her top opens right up and she ends up flashing her bra to the guys, she tries to fix her top but can't, her exhibitionism kicks in again and she can see the guys are enjoying the 'show' and she uses it to her advantage to get them to sign contracts and to seal the deal she takes her top off completely because 1, they sign and 2, she's getting off on it.
The photoshoot, like she says, wearing lingerie is just like wearing a bikini at the beach, some of those leaving little to the imagination, when she gets to the crotchless lingerie, Luke isn't sure but again her exhibitionism kicks in under the guise that she doesn't want to let the team down, she's getting off on it and at this time it's just guys looking at her body which excites her. The same with the see-through lingerie, she's actually the same as the flasher guy, they both get off on showing off their personal bits to 'relative strangers'. Even when she's doing the 'ad' and getting fully naked and touching herself, she's getting off on her exhibitionism, doing stuff in front of 'relative strangers', the same as the flasher dude, even when it comes to the blowjob, you can opt out, on my 2 runs for some reason I couldn't select that option, but there is still the exhibitionism of her doing something sexual in front of relative strangers by sucking Luke's cock.
In all those scenarios she is following her fetish, not Luke's, even if Luke gets off on seeing his wife doing this stuff in front of strangers, for it to be even more in to Luke's fetish she would suck Nate's cock instead, which she also gets off on sucking another guy's cock in front of her husband knowing that is enjoying watching her.