[throwaway9213]

What I've seen is that women typically make the social calendar. Once people are in a stable relationship, the woman's friends take priority because men abbrogate their responsibility to make plans because it's easier to let their wife or girlfriend make them. If this happens, mens friends drift away.

[adamconroy]

Yes, although fortunately for me my wife has become friendly with a lot of my mates' wives / girlfriends, so we still catch up when they organize things.

[ionised]

It's weirdly the opposite for me.

Girlfriend doesn't speak to her friends much, and relies on me a lot of the time to organise events/gigs/trips.