Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. There are number of types of sex parties: Swinger party/gathering A swinger party or partner-swapping party is a gathering at which individuals or couples in a committed relationship can engage in sexual activities with others as a recreational or social activity. Typically featured are hitting, choking, name-calling and hair-pulling. Pegging is a sexual practice in which a woman performs anal sex on a man by penetrating the man anus with a strap-on dildo. John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. The current record is held by Lisa Sparks who had sex with 919 men on October 16, 2004 in Warsaw, Poland as part of the Third Annual World Gangbang Championship and Eroticon 2004. The genres of pornography are based on the type of activity featured and the category of participants, for example mateur pornography is a category of pornography that features models, actors or non-professionals performing without pay, or actors for whom this material 3d hentai is their only paid modeling work. Specific sex acts Anal Anal pornography features anal penetration with a penis, dildo, other objects, or some combination of them. In more vigorous forms of fisting, such as punching or punchfisting, a fully clenched fist may be inserted and withdrawn slowly. Stimulating the prostate from outside, via pressure on the perineum, can be pleasurable as well. Real medical shots or videos may violate gay boy porn privacy laws in some countries. Omorashi: The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to urinate. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. The term sadomasochism momsex is derived from the words sadism and masochism .