Works in this genre may explore philosophical, political or social issues. 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. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films. Lolita pornography caters 3d hentai to ephebophiles. To avoid soreness from this resulting friction, some may prefer to use a personal lubricant, masturbation cream or saliva during masturbation. Diaper fetishism is totally independent from pedophilia as the wearer derives pleasure only from the diaper and/or use of it. Bukkake is a sex act portrayed in pornographic films, in which several men ejaculate on a woman, or another man. Many fantasies include the macrophile shrinking before a normal sized woman or keeping gay fuck his or her normal height while the partner grows in size. Pornography may fall into more than one genre. A woman can use a secondary vibrator, between the dildo and her genitals, to get pleasure from pegging. In the West, masturbation in private or with a partner is generally considered a normal and healthy part of sexual enjoyment. Most bisexual porn is made by small mature milfs production companies rather than the major studios. For a foot fetishist, points of attraction include the shape and size of the foot and toes , jewelry , treatments , state of dress , odor, and sensory interaction . The activity is done by itself or as a part of or prelude to other activities which many times involve sex. The other person may do the same during or after. Women oriented pornography is sometimes referred to as sex positive pornography. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity.