The most common male masturbation technique is simply to hold the penis with a loose fist and then to move the hand up and down the shaft. Lolicon and its contribution to the controversy regarding the regulation of pornography of depicting minors that don’t exist has been a major issue for free speech in and outside of Japan. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. The niche popularity grew significantly in the latter half of the first decade of the 2000s. For example, in Australia it is rated Refused Classification . A bisexual threesome may involve a man having sex with a man and a woman, the woman having sex with a man and a woman, or all three having sex with each other. Hermaphrodite, also known as herm, refers to pornography, typically hentai, that features persons with the genitalia of both sexes. Both sexes sometimes apply lubricating substances to intensify sensation. Clothed female, naked male pornography features naked men and clothed women; typically, the women humiliate and abuse the men or perform fellatio and/or handjobs on the men. Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed. Macrophilia is a fascination with or a sexual fantasy involving giants, more commonly expressed as giantesses . Once insertion is complete, the fingers are either clenched into a fist or kept straight. Women oriented pornography is sometimes referred to as sex positive pornography. Sub-genres can also be classified into the characteristics of the performers or the type of sexual activity on which it concentrates, and not necessarily on the market to which each sub-genre appeals. The use of the word creampie to describe such scenes originated in U. The term sadomasochism is derived from the words sadism and masochism . Oral lesbian milfs sex pornography frequently features anime hentai a person performing fellatio, and less frequently cunnilingus. Use of the agreed safeword is seen by some as an explicit withdrawal of consent.