For, he (Ravana) was formerly cursed by that person (Nalakubera) to the effect that if he would enjoy any woman against her will, his head should surely be split into a hundred fragments.
यदि ह्यकामा सेवेत स्त्रियमन्यामपि ध्रुवम्। शतधास्य फलेन्मूर्धा इत्युक्तः सोऽभवत् पुरा॥