The Compendium of Caraka 2.6.8_1

2.6.8_1

kṣayamapi copagacchati retasi yadi manaḥ strībhyo naivāsya nivartate, tasya cātipraṇītasaṅkalpasya maithunamāpadyamānasya na śukraṃ pravartate 'atimātropakṣīṇaretastvāt, tathā 'asya vāyurvyāyacchamānaśarīrasyaiva dhamanīranupraviśya śoṇitavāhinīstābhyaḥ śoṇitaṃ pracyāvayati, tacchukrakṣayādasya punaḥ śukramārgeṇa śoṇitaṃ pravartate vātānusṛtaliṅgam/

Even as his semen undergoes depletion, if his mind still does not turn away from women, and, having intensely directed intent, he engages in sexual intercourse, no semen is ejaculated due to excessive depletion of his semen; then, as his body strains, vāta enters the blood-carrying dhamanīs and dislodges blood from them, and because of that depletion of semen, blood is discharged instead through the seminal passage with symptoms accompanied by vāta.