Cunnilingus is an oral sex act performed by a person on the vulva or vagina of another person. The clitoris is the most sexually sensitive part of the human female genitalia, and its stimulation may result in a woman becoming sexually aroused or achieving orgasm. Cunnilingus can be sexually arousing for participants and may be performed by a sexual partner as foreplay to incite sexual arousal before other sexual activities (such as vaginal or anal intercourse) or as an erotic and physically intimate act on its own. Cunnilingus can be a risk for contracting sexually transmitted infections (STIs), but the transmission risk for oral sex, especially HIV transmission, is significantly lower than for vaginal or anal sex. Oral sex is often regarded as taboo, but most countries do not have laws which ban the practice. Commonly, heterosexual couples do not regard cunnilingus as affecting the virginity of either partner, while lesbian couples commonly do regard it as a form of virginity loss. People may also have negative feelings or sexual inhibitions about giving or receiving cunnilingus or may refuse to engage in it. Etymology and terminology The term cunnilingus is derived from the Latin words for the vulva (cunnus) and the verb "to lick" (lingō). There are numerous slang terms for cunnilingus, including "drinking from the furry cup", "carpet munching", and "muff-diving". Additional common slang terms used are "giving lip", "lip service", or "tipping the velvet"; this last is an expression that novelist Sarah Waters argues that she "plucked from the relative obscurity of Victorian porn". It is also popularly known in the urban community as "dining at the Y" or "DATY". A person who performs cunnilingus may be referred to as a "cunnilinguist". Practice General General statistics indicate that 70–80% of women require direct clitoral stimulation to achieve orgasm. Shere Hite's research on human female sexuality reports that, for most women, orgasm is easily achieved by cunnilingus because of the direct clitoral stimulation (including stimulation to other external parts of the vulva that are physically related to the clitoris) that may be involved during the act. A person who performs cunnilingus on someone might be referred to as the giving partner, and the other person as the receiving partner. During the activity, the receiving female's partner may use fingers to open the labia majora (genital lips) to enable the tongue to better stimulate the clitoris, or the female may