In the fetish cuckolding subculture, it is most common for the female to take on the sexually dominant role and the male the submissive role, however, female subs, sometimes referred to as cuckqueans, also exist. The person receiving anilingus is regarded as the passive partner in the act, and the person performing anilingus is the active partner. Use of the agreed safeword is seen by some as an explicit withdrawal of consent. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. It is sometimes combined with BDSM features. Compensating elements of the total dominance and submission are care and devotion complementing one another, thus facilitating stable relationships. People may engage in anilingus for its own sake, before anal fingering or penetration, or as part of foreplay. Once insertion is complete, the fingers are either clenched into a fist momsex or kept straight. The phrase is commonly found on gay twinks porn sites. Depictions of male 3d hentai and female masturbation are common in pornography, including gay pornography. The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. Mutual masturbation can be practiced by males or females in pairs or groups with or without actually touching another person as indicated by the following examples of contact versus non-contact scenarios: Non-contact mutual masturbation Two people masturbating in the presence of each other but not touching. It contains graphic sexual activity and visible penetration. If this is done using penises and/or strap-on dildos, this is sometimes called the sandwich or BigMac. Entacle erotica describes a type of pornography most commonly found in Japan which integrates traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme. They further argue that setting a discrete line between safe and not-safe activities ideologically denies consenting adults the right to evaluate risks vs rewards for themselves; that some adults will be drawn to certain activities regardless of the risk; and that BDSM play—particularly higher-risk play or edgeplay—should be treated with the same regard as extreme sports, with both respect and the demand that practitioners educate themselves and practice the higher-risk activities to decrease risk.