Is this there a connetion?

[tha]

Hi
My boyfriend and i have been discussing if bdsm lifestile is something for us. We tried bondage and submissive tasks a few times, and both enjoyed it a lot. Shortly after he begins sleeping a lot, he could fall asleep before the computer. Therefore he ses the doctor. He said that it was possibly was the exam-presure that caused it. That the presure had released to many bad thougths of his childhood. Where he was beaten and thrated badly. Both in school and from his step father.
I'am affraid that there is a connection between us trying bdsm and his problems. Right after we tried bdsm the first time we experienced flourihing in both sexulal life and happienes for each other. After a week we sliped into the normal sexual life again. Suddenly he wasnt able to have sex in a while. Then his exam began and he started sleeping a lot, it got a lot worse after he wisited his mother for christmas.
After returning from hollyday we had a normal sexlife until recently where we again started bdsm. again the same happienes.
My questions is could there be a connetion between his psychological state and bdsm? And have a negative effect on him and can it be worsened by continueing this woyage?