Ashtangasamgraha 9.60

9.60

śuṣkaṃ rūkṣaṃ yathā kāṣṭhaṃ jantujagdhaṃ vijarjaram |

spṛṣṭamāśu viśīryeta tathā vṛddhaḥ striyaṃ vrajan ||

kuryānmadātyayaṃ tasmādiṣyate harṣaṇī kriyā ||

parasparapratidvandvairebhireva śamaṃ nayet ||

Just as dry, unctuous-less wood eaten away by vermin and completely worn out / quickly shatters when touched, so does an old man who goes to a woman.
[Otherwise] it would cause alcoholic intoxication; therefore an exhilarating treatment is desired.
One should bring about pacification through these very mutual adversaries.