As a member of this 'club', I can say from experience that it's all about foreplay to make the sex enjoyable. I haven't had a problem even with girls that are between one and two fingers tight, but trying to just rush to sex would not work out well. It's best to ease into things and to get each other really turned on before the main event.
Granted we're not talking pound fest and positions are limited, but we were able to have good sex. A few of the tigher girls did comment after the fact that they needed a few days to feel normal again, one of which said "so this is what they mean when you need to walk like a cowboy", which was funny as hell.
The first time I was with a girl that could handle the size was amazing. She was tall which I find helps with cock length for postions like girl on top. But as others have mentioned, there doesn't seem to be a correlation on what size a girl can comfortably handle girth wise (skinny chicks that handle it no problem vs super tight voloptuous gals), so it's always an interesting discovery.