If this is done using penises and/or strap-on dildos, this is sometimes called the sandwich or BigMac. Said that the female buttocks evolved in the context of females competing for the attention and parental commitment of powerful resource-controlling males as an honest display of fat reserves that could not be confused with another type of tissue, although T. Boot fetishism is a sexual fetish dedicated to boots. Such films continued to be produced but could only be distributed by underground gay boy porn channels. Simultaneous penetration of the mouth and either the vagina or anus. Mutual masturbation can be practiced by males or females in pairs or groups with or without actually touching another person as indicated by the following examples of contact versus non-contact hentai videos scenarios: Non-contact mutual masturbation Two people masturbating in the presence of each other but not touching. A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry began producing a series of films ostensibly setting gangbang records for most consecutive sex acts by one person in a short period. See Gay-for-pay. Reflective of its views on sexuality and culture, Japanese pornography delves into a wide spectrum of heterosexual, homosexual, and transgender sexual acts in addition to unique fetishes and philias. It is commonly depicted in pornography, but very rarely in mainstream cinema. The buttocks in human females thus contain more adipose tissue than in males, especially after puberty. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. Lesbian pornography made for women is usually made by women, and usually features women who identify as lesbian or bisexual. Most soft crush fetishists avoid being placed under the same milf xxx label as hard crush fetishists, believing that crush films with larger animals give the entire group a bad label.