That sounds pretty standard.
My running policy with my ladyfriends is I don't care who they bang, as long as its someone that respects them and respects the relationship that we have. If they end up falling in love, awesome, same requests are still in place. I would always prefer to know and trust the other person intimately but I feel even less comfortable trying to dictate their lives based on my own comfort level.
If you're more familiar with someone, you trust them more. Someone being intimate with someone you care about is a really fucking personal thing and you're less likely to be comfortable when its just "some guy" as opposed to someone you are at least familiar with.
I am as direct as a T-Rex with 'roid rage and about as subtle. It isn't intended to cause upset, I just prefer to talk plain. There are plenty of other people here who do the nice, polite thing much better than I can. I'm what you'd call a "problem dinner guest."