Well she cums with her lovers during sex. She will also clean their cocks by sucking them clean after sex (not anal tho). They also get anal. I got her ass twice in 25 years but they get it monthly at minimum.
I can relate 100%. My wife is the same way. We get into mfm with a guy we know pretty regularly now.
When she and a were first dating she'd swallow my load no problem, became less frequent.
We tried anal 4 times ever, didn't go well.
Married 20+ years we start this sex fun with our friend, long story how it started, we're comfy with him now, it's fun.
After a few times with him joining us, maybe 6 months into it, one night they're on the bed messing around naked, she's sucking his dick, he says he's close, she held his butt and kept at it. He let out a grunt and let go in her mouth, I thought WTF ? She swallowed it all. Couple of minutes later she turns to me and starts on my dick, soon I'm fucking her, she starts to kiss me, I could easily taste his sperm in her mouth, kinda scared me but it was hot.
Now him and or I will fuck her and she has no problem cleaning the dick off with her mouth while other guy fucks her. It's a hot time and I guess she's OK with sperm in her mouth.
If it's just her and me we get it on but she dosent clean my dick off after, only when he's with us. She's different when he's with us.
Same with anal. One night he says "they" are gonna try anal. I knew she'd say no way but he put some lube on his hand, got her butt hole ready, lubed his dick and she didn't even try to stop him. He started to slide in, she let out the biggest grunt I ever herd as he slid in really slow. Soon he was up to his balls, took a full pump real slow, she asked if he was all the way in. He pumped her butt for 15 or so pumps then pulled out, she said WOW. I'm thinking what just happened?
He's fucked her butt quite a few times since then and she's into it. I've done her back there too when he's with us and shes into it with me too. Her and I alone, we have done anal but it's not the same as when he's with us.
Orgasm...our routine was, we'd kiss for a while and I'd finger her till she'd ask if I will lick her, I do, she cums then we fuck real nice, usually one round then maybe a 2nd round.
When he's with us we take turns doing her, she gets really turned on, he'll have her lay on her back, we all know what's happening. He mounts up, starts to fuck her, she stretches her legs straight down, he really gets going pumping hard, she cums hard, that gets him off. She never had cum with me like that. They get done then I fuck her, she feels so different and so sexy I don't last long. 2nd round, there's been times I'm fucking her and she does cum under me but not often. Her first cum is with him, her 2nd usually with him too but sometimes with me.
I have no complaints, the sex is great, she's horny as hell for a week after he's been with us. This has really sparked up our sex. But yea she's way different when he's with us.