Does a bearded man (he who has a beard) refrain from licking his wife's vagina on the pretext of disgracing the beard and the Sunnah of the Prophet (PBUH)?

Intercourse and enjoyment between spouses should be within the bounds of Islamic etiquette and noble morals. While there is no explicit text prohibiting oral sex, it is contrary to refined manners and noble ethics, and it goes against the sensibilities of sound human nature. Furthermore, there is a strong possibility of coming into contact with or swallowing impurities with saliva, which is forbidden.