Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/12/32

ब्रह्मोवाच ।। आराध्य गिरिजां देवीं प्रार्थयन्तु सुराश्शिवम् ।। योनिरूपा भवेच्चेद्वै तदा तत्स्थिरतां व्रजेत् ।। ३२ ।।

sanskrit

Brahmā said:— Let the gods propitiate goddess Pārvatī and pray. If she can assume the form of the vaginal passage that penis will become steady.

english translation

brahmovAca || ArAdhya girijAM devIM prArthayantu surAzzivam || yonirUpA bhaveccedvai tadA tatsthiratAM vrajet || 32 ||

hk transliteration by Sanscript