Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. Interactive pornography, available in CD-ROM and DVD format, allows the viewer to select the particular acts performed at any one time, sometimes with the camera providing a first person view. What seems clear from the historical record is that much of the lesbian material in pornographic texts was intended for a male readership. Bisexual pornography is a genre of pornography which most typically depicts one woman and two men who all perform sex acts on each other. Usually that person prefers to stage the wetting so that his/her legs become soaked with urine. The phrase is commonly found on porn sites. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal. Foot fetish pornography features heavy emphasis on the feet of the participants, either in combination with kissing and genital sex or in the context of acts such as trampling or crush fetishism. The term sadomasochism is derived from the words sadism and masochism . A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. Reality pornography is professionally made porn which seeks to emulate the style of amateur pornography. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. People may engage in anilingus for its milf porno own sake, before anal fingering or penetration, or as part of foreplay.
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