Charak Samhita
तत्र श्लोकौ- हेतुर्योगोपदेशस्य योगा द्वादश चोत्तमाः। यत् पूर्वं मैथुनात् सेव्यं सेव्यं यन्मैथुनादनु ॥५२॥
॥ Summary॥ To sum up- In this quarter, called Pumanajata Baladika, the purpose for which the virilifying preparations have been prescribed along with twelve excellent virilific recipes.
english translation
tatra zlokau- heturyogopadezasya yogA dvAdaza cottamAH। yat pUrvaM maithunAt sevyaM sevyaM yanmaithunAdanu ॥52॥
hk transliteration by Sanscript