Lolita pornography caters to ephebophiles. For some people, non-penetrative sex is the primary sexual activity of choice above all others. Creampie pornography features ejaculation inside the vagina , mouth or rectum instead of the common cum shot, followed by the visible seeping or dripping of semen from the vagina, mouth or anus. Group sex also occurs in populations of non-human animals such as bonobo apes and chimpanzees. The glans itself may widen and lengthen as the stimulation continues, becoming slightly darker in colour, while the gliding action of the foreskin reduces friction. Some masturbate only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. Rimjob pornography centers around anilingus. In some creampie films, both gay and straight, intercourse and internal ejaculation are followed by performers licking up the semen that has dripped from their bodies. Common phrases used to refer to these individuals are chicks with dicks or the derogatory term shemale, although these hentai sex are generally considered pejorative among transwomen. Cum shots typically do not appear in girl-girl scenes and orgasm is normally implied by utterances, cinematic conventions, or body movement. Those with diaper-related paraphilias differ widely in their focus of attention. Macrophilia is a fascination with or a sexual fantasy involving giants, gay twinks more commonly expressed as giantesses . Shotacon : Similar to Lolicon, this genre involves prepubescent or under-aged boys mature milfs between the ages 6–12. Positions can also be chosen specifically for added effects such as increased humiliation, elevation and suspension. On the other hand, the masochist enjoys being hurt, humiliated, or suffering within the consensual scenario.