We really enjoy mfm fun with a (white) guy we know. He's a super cool guy. He's got a much bigger dick than me. Wife very obviously likes sex with him a LOT. We take turns with her, she loves when we switch out. He gets more sex time with her but I get plenty.
We're mid 50s, he's 34. Wife has no problem having an orgasm with him during intercourse. She has never had one with me during sex, oral, vibrator no prob. She typically has three good cums when he's with us, one from us licking her, one when he's doing her then another with him.
It's all good. There's absolutely no humiliation, she's never said anything about how he's bigger or better, she just says it's different.