Voto:
Sexual penetration usually refers to the physical act of sexual union between two or more individuals. This act can be performed by people with bisexual, heterosexual, or homosexual orientations. It consists of the insertion of the penis into the vagina or the anus of the partner; in the latter case, it is referred to as anal sex. When both partners are male, the subject who inserts the penis is defined as active, while the one who receives it is passive: in group sex activities, in some cases, a male may simultaneously take on both roles. Curious in this regard is the statement by Aretino: «Chi n'ha poco in cul fotta dì e notte, ma chi l'ha, com'i'ho spietato e fiero, sbizzarriscasi sempre nelle potte» (Pietro Aretino, Sonetti lussuriosi, n° 3). The most common and widespread positions for intercourse are six: 1. position with the man on top (missionary position); 2. position with the woman on top; 3. sitting position; 4. standing position; 5. lateral position; 6. rear position (more ferarum). Improperly, the term penetration can also be used to describe oral sex or masturbation understood as the introduction of fingers or hands (fisting) into the vagina or anus. When we talk about sexual penetration, it also refers to sex practiced with objects, for example, through plugs, dildos, or vibrators, and so generally to the insertion of any object or body part into any orifice of the male or female body, in order to obtain sensations of pleasure and sexual excitement. In these activities, generally, to reduce the risk of unwanted pregnancies or sexually transmitted diseases, condoms are used; an intimate lubricant is indispensable in some cases and is nonetheless a valuable aid for the comfort of the practice. A sexual toy generally refers to a small or medium-sized object made from various materials, used during sexual activities both in pairs and in groups, or even individually, to enhance eroticism. There are categories of objects targeted at various types of audiences, such as sadomasochism, bondage, autoeroticism, and others. Among the most commonly used are vibrators, dildos, and inflatable dolls, as well as Ben Wa balls or Chinese balls, whips, ropes, handcuffs, clitoral stimulators, vibrating rings, cock rings, and many others, including simulacra of some parts of the human body, such as hands, tongues, vaginas, and anuses, usually made from plastic materials that resemble human skin in appearance and touch; some of these feature internal mechanisms powered by batteries, capable of simulating the movement of the anatomical part. Household objects, as well as certain phallic-shaped vegetables, can be used as sexual toys, for example, spoons, ice cubes, feathers, carrots, zucchinis, etc. Beverages and foods in cream form, as well as liquors and chocolate, can also be part of the play. Some medical tools and instruments are used for this purpose; the use of enemas is common, as well as various types of dilators, both anal and vaginal.