My (newly) open marriage has similar rules as described by @liubit, we find guys separately, no bringing guys at home, tell everything, only working boys, EXCEPT that we allow to get one-off hook ups, but if we find one, then we have to use the hookup guy only once and block him immediately afterwards. In short, affairs are not allowed. So if it is for pay, as many times with the same guy as we want, if it is for free, only one-time fucks are allowed, because we don’t want a guy to fall in love with us.
Ps: while we know with who, we don’t actually discuss the what or how very much.