Mammary (paizuri) is the sexual act in which the female’s breasts are involved and used in the stimulation of the male’s penis. Commonly, this sex act involves the man placing his penis in the woman’s cleavage and thrusting between her breasts, while the breasts are squeezed around the penis for additional stimulation.

Researcher Austen Woods, in a study of the condom usage habits of New Zealand’s sex workers, said that they offered safe sex alternatives to clients who refused to wear a condom. Woods quoted a sex worker saying that mammary intercourse was one alternative used, because she claimed it felt to clients like sex without a condom when performed by a woman with large breasts.

Several slang terms refer to mammary intercourse, such as boobjob, titfuck or titty fuck in the United States, as well as tit wank or French fuck in the United Kingdom. The Japanese sex industry uses the term paizuri (from oppai, a slang word for breast).

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