The Cupid's bow or tubercle is a facial feature where the double curve of a human upper lip is said to resemble the bow of Cupid, the Roman god of erotic love. The peaks of the bow coincide with the philtral columns giving a prominent bow appearance to the lip.
- For pity now she can no more detain him; (577)
- The poor fool prays her that he may depart:
- She is resolv'd no longer to restrain him,
- Bids him farewell, and look well to her heart, (580)
- The which, by Cupid's bow she doth protest.
Newborn babies with Fetal Hydantoin Syndrome, a consequence of using Hydantoin and/or its major derivatives Phenytoin, Dantrolene and Fosphenytoin, can present with the Cupid's bow defect known as cleft lip.
A study by the University of the West of Scotland conducted through an online survey of predominantly Scottish, predominately college student women found that a more prominent cupid's bow (as assessed by the online respondent) was associated with a greater likelihood of vaginal orgasm during penile/vaginal sexual intercourse. 
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- Shakespeare, William. "Venus and Adonis". Classic Literature Library. Retrieved 30 June 2012.
- Alexander, Brian (June 24, 2011). "Shape of a woman's pout may mean better sex". MSNBC.
- Brody, Stuart; Costa, RM (October 2011). "Vaginal orgasm is more prevalent among women with a prominent tubercle of the upper lip.". The Journal of Sexual Medicine 8 (10): 2793–9. doi:10.1111/j.1743-6109.2011.02331.x. PMID 21676178.
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