When having sex, have your female partner suddenly clawed at your back? This is certainly not done by all women. For you men do not misunderstand the action as a crude action. Because it was launched from the action was triggered by a variety of reasons
The first is as a way to show that He enjoys the way you make love. If the he does this means the technique you apply according to his wishes. The second reason is because He feels exasperated. It could be because you two have not been in a relationship for a long time.
The other reason is because he feels he wants to do some rough acts that have not been done for a long time. Maybe he missed you as a man not to always act romantically when in touch.
Not only that, women who clawed at the time may do so by accident. Intense relationships sometimes make women unable to resist. As a result he did actions that he did not realize, such as scratching.
The last is because He feels his desire will rise again when doing that action. If you have this, you have to accept the pain that will whack after the connection.