In some areas, there are laws stating it is not legally possible to consent to be killed, and elsewhere it may still be legally dubious . One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other participants. The consent and compliance for a sadomasochistic situation can be granted only by people who can judge the potential results. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. Group sex is sexual behavior involving more than two participants. There are currently no known laws forbidding the crushing of objects and insects, however the production or trade of crush erotica involving live vertebrates is condemned by animal rights activists and is illegal in many countries, including the United States and Great Britain. The speed of the hand motion will vary from person to person, although it is not uncommon for the speed to increase gay sex video as ejaculation nears and for it to decrease during the ejaculation itself. In the context of consensual erotic activities, sadism and masochism are not strictly accurate terms; there is a significant difference from the medical or psychological usage of both terms. By Japanese law, the genitals of actors and actresses must be censored and up gay hentai the mid-1990 so was the depiction of pubic hair. There were also a very limited number of specialist fetish magazines which featured images of bondage, such as the famous Bizarre magazine published from 1946 to 1959 by the pioneering fetish photographer John Willie, and ENEG Exotique magazine, published 1956-1959. Other possibilities are possible, such as a man having sex with two women who are having sex with milf xxx each other. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings. Fantasies of group sex are extremely common among both men and women, and group sex is a subgenre in pornographic films.