The range of its individual characteristics is thereby wide. As of 2013, little analysis of this paraphilia has been reported in medical literature. Since the 1980s, many practitioners and organizations have adopted the motto safe, sane and consensual, commonly abbreviated as SSC, which means that everything is based on safe activities, that all participants be of sufficiently sound/sane mind to consent, and that all participants do consent. Target audience are teenage / young adult women. Cuckolding can also be mixed with other non-monogamous relationship arrangements with which it has substantial overlap such as Swinging, wife-swapping, open relationships, and polyamory, etc. Mammary intercourse is said by Alex Comfort to produce mutual orgasm in women with sensitive breasts , and it was one of the nine substitute exercises for penetrative sexual activities, as detailed in the Paradis Charnels of 1903. It is commonly depicted in pornography, but very rarely in mainstream cinema. Ass to mouth pornography shows the transfer of a performer penis from a second performer anus to that same second performer mouth in a single shot. Once insertion is complete, the fingers are either clenched into a fist hentai porn or kept straight. Jerk off instruction features a performer encouraging or instructing the viewer to masturbate, often culminating in a countdown at the end of which the viewer is invited to induce orgasm. The current record is held by Lisa milf fuck 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. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. The concept of lesbian, to differentiate women with a shared gay twinks sexual orientation, is a 20th-century construct. Throughout history, women have not had the same freedom or independence to pursue homosexual relationships as men, but neither have they met the same harsh punishment as homosexual men in some societies.