Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. Older names for a pornographic film include stag film, and blue movie. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . Usually that person prefers to stage the wetting so that his/her legs become soaked with urine. The reverse of this, in which nude women interact with clothed men, is called Clothed male, naked female . Other gay twinks objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. It is used, for example, at fertility clinics to stimulate sperm donors. There has been an increase in discussion and portrayal of masturbation in art, popular music, hentai sex television, films, and literature. The arousal from being desperate comes from the sensation of having a full bladder. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity lesbian milfs is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal. Omorashi: The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to urinate. The strategies and tactics that are used to smuggle one of the couple into and out of the toilet undetected are as important or almost as important as the urination. The most common type of erotic spanking is administered on the bare buttocks, but can also be combined with bondage, in order to heighten sexual arousal and feelings of helplessness.