Valmiki Ramayana 1.15.23

राक्षसो रावणो मूर्खो वीर्य उद्रेकेण बाधते ।ऋषयः च ततः तेन गन्धर्वा अप्सरसः तथा॥

rākṣaso rāvaṇo mūrkho vīrya udrekeṇa bādhate |ṛṣayaḥ ca tataḥ tena gandharvā apsarasaḥ tathā ||

Our plain-language meaning of this verse is waiting for scholar review.