Sex and the City

"In love relashionships there is a tenuos line between pain and pleasure. In fact it is common believed that a relashionship without pain it doesn't worth it. To some, pain employes growth. When do you know when the growing pain stop and the pain pain take over? Are we masoquists or optimists if we continue to walk that line?When it comes to a relashionship how do we know when enough is enough? "