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. Typically features adult, masculine men with varying degrees of muscle, body fat, and body hair, akin to beefcakes, or bears. As the prostate is touch-sensitive, some directly stimulate it using a well-lubricated finger or dildo inserted through the anus into the rectum. A pornographic work is characterized as hardcore if it has any hardcore content. Some masturbate only using pressure applied to the clitoris without direct contact, for example horny milfs by pressing the palm or ball of the hand against underwear or other clothing. To avoid soreness from this resulting friction, some may prefer to use a personal lubricant, masturbation cream or saliva during masturbation. No causal relationship is known between masturbation and any form of mental or physical disorder. 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. A threesome is also depicted with one woman and two men who all perform sex acts on each other . Yaoi male homosexual hentai designed to appeal to women and men. Felching is a sexual practice involving the act of orally sucking semen out of the vagina or anus of one partner. 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. A bisexual threesome may involve a man having sex with a man and a woman, the woman having hot gay sex sex with a man and a woman, or all three having sex with each other. Breeding is sometimes followed by felching, which involves sucking the semen from the partner anus. Nubile refers to a young woman who is ready or suitable for marriage by virtue of her anime hentai age or maturity. While some fantasize about a giantess who is slightly taller than himself, others are interested in giantesses that are hundreds or even thousands of feet tall.