Yes.
Over the years I have become such a person to a very good woman friend of mine. She is not a sexual partner to me, and has her own relationship going.
When I go over for errands to the mainland, we meet up for a coffee or drink, and occasionally....particularly when there is a problem afoot, yes, she comes to spend a weekend at my place.
As to whether she discusses this with her partner I wouldn't know, that is her business, and I don't ask. All I know is there is a trust between us and when we do meet it is highly enjoyable, and makes me glad she is there for that moment.
If I therefore am with someone, and they want to go meet some friend of theirs who is male, no, I see nothing wrong with that.
Closing off the argument, if a woman is with me, she is there because she wants to, not cause I made her. If there is a need for her to go to bed with somebody else, then there is something wrong in our relationship, and she simply would not be with me.