Shiva Purana
मैथुनाय विचेष्टंतीं परपुंसोभिशंकया ॥ मुखतो नासिकायां तु शुक्रं तत् व्यदधान्मुने ॥ ३३॥
O sage, in the course of the sexual activity she suspected him to be another man. Hence she received the semen through the mouth into the nostril.
english translation
maithunAya viceSTaMtIM parapuMsobhizaMkayA ॥ mukhato nAsikAyAM tu zukraM tat vyadadhAnmune ॥ 33॥
hk transliteration by Sanscript