There is a far more reasonable system for determining what's acceptable. Make an effort to consider how you'd feel of the roles were switched. If you are considering whether any particular activity is cool with females other than your significant other, you must determine how YOU would feel if she were to engage in that very activity with other men. If you can honestly say it wouldn't bother you, than there's no double standard and you are good to go. She may feel differently, and it might be a good idea to talk about it, but only if she is reasonable. If not, than it's probably better not to bring it up, because once you AGREE to her terms, you're basically fucked.