Other terms associated with frottage are: It is also known as sensual massage. Oral sex, for example, which can include oral caress of the genitalia , as well as penile penetration of the mouth or oral penetration of the vagina, may be categorized as non-penetrative sex. It is also spread by skin-to-skin contact with the genitals Chancroid is spread through skin-to-skin contact when an infected individual has sores present and these sores come into contact with another individual generally in the genital area Cytomegalovirus CMV is spread through coming into contact with various body secretions saliva, genital excretions, blood etc. Auden was proud of having been the first person to use the terms Princeton rub and Princeton first-year in print. It can involve the use of oils heated or otherwise or just the individual's hands. This can be done between two or more people of any gender and sexual orientation.
Auden was proud of having been the first person to use the terms Princeton rub and Princeton first-year in print. Variations where the clitoris is stimulated by feet also occur. Dual protection using both a barrier device and hormonal method can be significantly effective at preventing both pregnancy and STI transmission. Exclusively non-penetrative Mammary intercourse , a form of non-penetrative sex between a man and a woman Non-penetrative sex may sometimes be divided into acts that are exclusively non-penetrative and those that are not. Although the risks associated with non-penetrative sex acts are significantly less than those associated with penetrative sex, there are still risks that can occur. Sexual stimulation of the genitals by using the feet may also be included, and so may manual stimulation of the anus. Definitions and practices General While non-penetrative sex or outercourse is usually defined as excluding sexual penetration,    some non-penetrative sex acts can have penetrative components and may therefore be categorized as non-penetrative sex. Princeton rub, Ivy League rub, and so on are slang terms referring to male-male frot or intercrural sex or both, presumably surviving from the days when these colleges only admitted men. It is often used as a form of mutual masturbation. Kissing may also be done on other parts of the body and is commonly a part of foreplay. The term heavy petting covers a broad range of foreplay activities, typically involving some genital stimulation, but not the direct act of penetrative sexual intercourse. Hookup culture In many developed countries , there is a trend where young individuals typically late teens and early twenties engage in casual sex , also known as a hookup. Oral sex, for example, which can include oral caress of the genitalia , as well as penile penetration of the mouth or oral penetration of the vagina, may be categorized as non-penetrative sex. The two young people were each in a sack tied up at the neck, and put in a bed together for the night. This phenomenon has been termed hookup culture. In addition, hooking up can mean different things to different people. In some cases it can be part of a foot fetish. Lubrication may be used to allow the penis to move more freely between the thighs. Typically, one person lies down pant-less, while his or her partner sits alongside. It is also spread by skin-to-skin contact with the genitals Chancroid is spread through skin-to-skin contact when an infected individual has sores present and these sores come into contact with another individual generally in the genital area Cytomegalovirus CMV is spread through coming into contact with various body secretions saliva, genital excretions, blood etc. Human papillomavirus HPV is spread through skin-to-skin contact Molluscum contagiosum is spread through close contact with an infected person sharing personal items or close skin-to-skin contact Crab louse also known as pubic lice or crabs can be spread through close contact with an infected person Scabies is spread through close contact with an infected individual Syphilis can be spread through kissing, but is much more likely to be spread through vaginal, anal or oral intercourse Trichomoniasis Trich can be spread through sharing sex toys , during mutual masturbation or any time genital fluid are passed from one person to another With regard to non-exclusive non-penetrative sex acts, the risks somewhat increase because there is penetration either of the vagina, anus or mouth and there is the potential for bodily fluids semen, vaginal secretions, saliva to be exchanged. Condoms , which can provide STI protection Dental dams , which offer STI protection during oral sex Latex gloves, which can be used during mutual masturbation or fingering to prevent the risk of STI transmission If a person is concerned about the minor risk of pregnancy from non-penetrative sex, there are also several hormonal contraceptive birth control methods that can be used. Types of mutual masturbation include the handjob the manual sexual stimulation of the penis or scrotum by a person on a male  and fingering the manual sexual stimulation of the vagina , clitoris or other parts of the vulva , by a person on a female. It is known as fellatio when the act is performed on a penis, and cunnilingus when performed on female genitalia. In addition to the aforementioned STIs, the following can be transmitted through non-exclusive non-penetrative sex acts: Expanded orgasm as a mutual masturbation technique reportedly creates orgasm experiences more intense and extensive than what can be described as, or included in the definition of, a regular orgasm.
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