The two sets of people involved often meet either randomly or arrange to meet up beforehand over the Internet. Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. Felching is a sexual practice involving the act of orally sucking semen out of the vagina or anus of one partner. Its gain in prominence has been attributed to its depiction in the film Pecker, which was released in 1998. The term has origins in lesbian hentai the Greek language . In humans, females generally have more round and voluptuous buttocks, caused by estrogen that encourages the body to store fat in the buttocks, hips, and thighs. This is videos porno gay commonly called double vaginal penetration or double stuffing. Macrophilia is a fascination with or a sexual fantasy involving giants, more commonly expressed as giantesses . The warm sensation felt when urine trickles on the body seems to give very naked milf relaxing and pleasurable feelings to the person. 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. Content featuring male bisexuality has been a growing trend since the advent of internet pornography. Today, pornographic films can be sold or rented on DVD, shown through Internet and special channels and pay-per-view on cable and satellite, and in adult theaters. Among swinging couples, one of the two partners is often the driving force and the other is more passive-supportive of the addition of additional sex parties. While wearing diapers, a diaper fetishist generally experiences a comforting feeling. Shotacon : Similar to Lolicon, this genre involves prepubescent or under-aged boys between the ages 6–12. Although there may be no connection between coprophilia and sadomasochism , the limited data on the former comes from studies of the latter. Breeding is sometimes followed by felching, which involves sucking the semen from the partner anus.