Many transgender people regard the term shemale as offensive, arguing that it mocks or shows a lack of respect towards the gender identity and gender expression of transgender individuals; in this view, the term emphasizes the biological sex of a person and neglects their gender. A person may be sexually penetrated multiple times simultaneously. Pantyhose/Tights/Stockings pornography involves women or men dressed in pantyhose, tights, or stockings. Mammary hentai porn intercourse involves the man placing his erect penis in the woman cleavage and thrusting between her breasts, while the breasts are squeezed around the penile shaft, thus creating a tight cleft for stimulation. Typically features adult, masculine men with varying degrees of muscle, body fat, and body hair, akin to beefcakes, or bears. Breast fetishism is a paraphilic sexual interest focused on female breasts . Smotherboxes are usually naked milf custom made pieces of furniture that may have a special significance for their users. Mammary intercourse has sometimes been considered a perversion. As well as traditional attraction, the topic also incorporates feederism and gaining, where sexual gratification is obtained via the process of gaining body fat. The cover is open while the submissive lies down on his back and places his head in the box. The consensual submission of the submissive is sometimes demonstrated to others by symbols indicating his/her belonging to the dominant, such as wearing a collar, special tattoos, piercings, a very short haircut or a bald head. The two sets of people involved often meet either randomly or arrange to meet up beforehand over the Internet. Milking pornography features lactating women being milked or milking themselves . Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. The resulting consent and understanding is occasionally summarized in a written contract, which is an agreement of what can and cannot take place. The term has also applied to other professions and even companies gay movies trying to appeal to a gay demographic.