A sexual relationship is a good thing to have. It's not the best relationship you could have, but it is good for both of you.
Dr. Anthony Campolo was my professor for Sociology, The Family at UPenn. He is a famous sociologist; used to be an advisor to Clinton. He teaches that there are 3 kids of sex: sex for fun, sex for love and sex for procreation. If both people are having sex for the same reason, then the sex is moral. However, if they are having sex for different reasons, then one person is likely to get hurt.
So you should be on the same page with her -- sex for fun, release of frustrations,etc. Try not to be having sex as an expression of love while she is doing it for fun. But if you are, you won't be the first person to do that. You just might get hurt.
