For me it would all be in the tone and the purpose. Is it disclosure to test the waters, flirt, add trust to their friendship, would they discuss it in your presence? Are they using it for titilation and are getting off on slightly overstepping the boundaries?
It's really impossible to say without actually seeing/hearing their conversation.
I must admit when I first read it, I wondered if it was a case of mentionitis and he was finding a cheeky stimulating way to mention her in front of you. Only you know his character and whether he would do something like that.
Personally I wouldn't like it but that's because it wouldn't fit in our relationship and would stand out. We share friends mostly and DH wouldn't feel comfortable in that situation. He would see it as flirting.
So in a way, I'd base my decision on him as a person rather than my thoughts as he may well have a different attitude.
So really, the question is "does your DH see a problem with it?"
Would he be happy if you said the same about a male friend? That will give you your answer.
I'd personally just ask him and say that you've never really discussed the boundaries of opposite sex friendships so how does he feel about it.
Or you could say that you were thinking about Tracy (as I believe she's been named upthread
) and you asked your mate John where he's had sex. See how that goes?
The private lunch dates wouldn't sit comfortably with me in the way they've been disclosed.
I really really hope you are ok and that it's nothing. However, if it steps outside your boundaries then it's ok to say so and have a discussion about it. You don't have to be comfortable with it. It doesn't mean you can demand he stops if it's innocent but he should know how you feel so he can make a decision on that.