Mammary intercourse describes a sex

Sex

In biology, sex is a process of combining and mixing genetic traits, often resulting in the specialization of organisms into a male or female variety . Sexual reproduction involves combining specialized cells to form offspring that inherit traits from both parents...

 act, performed as foreplay

Foreplay

In human sexual behavior, foreplay is a set of intimate psychological and physically intimate acts between two or more people meant to create desire for sexual activity and sexual arousal. Either or any of the sexual partners may initiate the foreplay, and they may not be the active partner during...

 or as non-penetrative sex

Non-penetrative sex

Non-penetrative sex is sexual activity without vaginal, anal, or oral penetration, as opposed to the penetrative aspects of those activities...

, that involves the stimulation of the male penis

Penis

The penis is a biological feature of male animals including both vertebrates and invertebrates...

 by the female breasts. Commonly, this sex act involves the man placing his penis in the woman's cleavage

Cleavage (breasts)

Cleavage, anatomically known as the intramammary cleft, is the space between a woman's breasts lying over the sternum. Cleavage is exposed by a garment with a low neckline, such as ball gowns, evening gowns, swimwear, casual tops and other garments....

 and thrusting between her breasts, while the breasts are squeezed around the penis for additional stimulation. Mammary intercourse can also be combined with fellatio

Fellatio

Fellatio is an act of oral stimulation of a male's penis by a sexual partner. It involves the stimulation of the penis by the use of the mouth, tongue, or throat. The person who performs fellatio can be referred to as the giving partner, and the other person is the receiving partner...

.

Slang terms

It is known as titty-fucking or a titfuck in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

, as well as tit wank or French fuck in the United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

. The Japanese sex industry

Sex industry

The sex industry consists of businesses which either directly or indirectly provide sex-related products and services or adult entertainment...

 uses the term パイズリ (paizuri) (from おっぱい (oppai), a slang word for breast).

Safer sex

Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection (STI) that requires direct contact between the mucous membranes  and pre-ejaculate

Pre-ejaculate

Pre-ejaculate is the clear, colorless, viscous fluid that emits from the urethra of a man's penis when he is sexually aroused. It is similar in composition to semen, but has some significant chemical differences...

  or semen

Semen

Semen is an organic fluid, also known as seminal fluid, that may contain spermatozoa. It is secreted by the gonads and other sexual organs of male or hermaphroditic animals and can fertilize female ova...

  is greatly reduced. Notably, HIV

HIV

Human immunodeficiency virus is a lentivirus that causes acquired immunodeficiency syndrome , a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive...

 is among the diseases that require such direct contact and is therefore very unlikely to be transmitted via mammary intercourse. A study of the condom

Condom

A condom is a barrier device most commonly used during sexual intercourse to reduce the probability of pregnancy and spreading sexually transmitted diseases . It is put on a man's erect penis and physically blocks ejaculated semen from entering the body of a sexual partner...

 usage habits of New Zealand

New Zealand

New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

's sex worker

Sex worker

A sex worker is a person who works in the sex industry. The term is usually used in reference to those in the sex industry that actually provide such sexual services, as opposed to management and staff of such industries...

s said that they offered various safe sex

Safe sex

Safe sex is sexual activity engaged in by people who have taken precautions to protect themselves against sexually transmitted diseases such as AIDS. It is also referred to as safer sex or protected sex, while unsafe or unprotected sex is sexual activity engaged in without precautions...

 alternatives to vaginal sex to clients who refused to wear a condom

Condom

A condom is a barrier device most commonly used during sexual intercourse to reduce the probability of pregnancy and spreading sexually transmitted diseases . It is put on a man's erect penis and physically blocks ejaculated semen from entering the body of a sexual partner...

. A sex worker said that mammary intercourse was one alternative used; mammary intercourse performed by a woman with large breasts felt to the client like penetrative vaginal sex.

See also

• Breast fetishism
  Breast fetishism
  Breast fetishism is a type of sexual fetish which involves a sexual interest in female breasts....
  
  
• Cleavage (breasts)
  Cleavage (breasts)
  Cleavage, anatomically known as the intramammary cleft, is the space between a woman's breasts lying over the sternum. Cleavage is exposed by a garment with a low neckline, such as ball gowns, evening gowns, swimwear, casual tops and other garments....