Contrary to the other two types, B/D does not define the Tops and Bottoms itself, and is used to describe the general activities with either partner being the receiver and the giver. By comparison, gonzo pornography puts the camera right into the action, often with one or more of the participants both filming and performing sexual acts, without the usual separation between camera and performers seen in conventional porn and cinema. 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. The term comes from the French voyeur, one who looks. Some men place both hands directly on their penis during masturbation, while others may use their free hand to fondle their testicles, nipples, or other parts of their body. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. Many times a top actor will then be sought as a bottom and the debut is often treated as a notable event or even its own release. Penetration may involve use of fingers, toes, sex toys, or penises. Soft swinging is when a couple engages in sexual activities with only each other while other couples perform sex acts in the immediate vicinity. Boots are seen as the gay cock perhaps most fetishistic of all footwear and boots may be the most popular fetish clothing attire. It is the most common form of sexual fetishism for otherwise non-sexual objects or body parts. A threesome is also depicted with one woman and two men who all perform sex acts on each other . In these research publications, it is suggested that real female ejaculation is the release of a very scanty, thick, and whitish fluid from the female prostate, while the squirting or gushing shown frequently in pornography hentai sex is a different phenomenon, the expulsion momporn of clear and abundant fluid, which has been shown to be a diluted fluid from the urinary bladder. 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.