Some productions are noted for sophisticated and/or experimental storytelling and animation techniques. Some couples use a threesome as a way to develop a love triangle . The essence of voyeurism is the observing but may also involve the making of a secret photograph or video of the subject during an intimate activity. In the 1920s, Havelock Ellis reported that turn-of-the-century porn milf seamstresses using treadle-operated sewing machines could achieve orgasm by sitting near the edge of their chairs. Softcore pornography generally contains nudity or partial nudity in sexually suggestive situations, but without explicit sexual activity, sexual penetration or extreme fetishism, while hardcore pornography may contain graphic sexual activity and visible penetration, including unsimulated sex scenes. It may involve sexual attraction to women who are pregnant or appear pregnant, attraction to lactation, or attraction to particular stages of pregnancy such as impregnation or childbirth. Can also include auto-fellatio, or performing oral sex on oneself. Gang bang pornography is a type of pornography that depicts an individual engaging in physical sexual activity with multiple partners sequentially or at once. The sub-genres usually conform to certain conventions, and each may appeal to a particular audience. A smotherbox has two openings. This yields a view that would not be obtainable directly through the eyes of a person while experiencing the sex act. Foot fetishism, foot partialism, foot worship, or podophilia is a pronounced sexual interest in feet. Big Beautiful Woman is a euphemism for an overweight woman and is frequently used in the context of fat fetishism. Freud, however, considered such extensions of sexual interest to fall within the range of the normal, unless marked out by exclusivity . Arguably the most famous example of the genre is the gay boy porn Taboo series. Some couples use pornography at times for variety and to create a sexual interest or as part of foreplay. When questioned about her particular gay hentai kink Covét replied, If we women have to take it from behind, then why not a man?