Testosterone discourages fat storage in these areas. The full-weight body-pressure, moisture, sex odors and darkness can be perceived as powerful sexual attractions or compulsions. The other person may do the same during or after. What seems clear from the historical record is that much of the lesbian material in pornographic texts was intended for a male readership. In the 18th and 19th centuries, some European theologians and physicians described it as heinous, deplorable, mature milfs and hideous, but during the 20th century, these taboos generally declined. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. The naked appearance of actress Demi Moore in the advanced stage of pregnancy on the cover of Vanity Fair magazine in 1991 marked the beginning of a period which has since seen pregnancy presented by celebrities as a glamorous state of living, while also creating a market for photographers to produce images of pregnant mothers, and for fashion stylists to introduce pregnancy styling to their business. Sadomasochism is practiced in isolation relatively rarely, though some masochists report biting, gay hentai pinching, or even stun-gunning themselves as a prelude to, or as part of, masturbation. 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 gay cock sex with each other. Rainbow parties were covered on The Oprah Winfrey Show in 2003, and became the subject of a juvenile novel called Rainbow Party. 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. It is also known colloquially as gushing or squirting, although these are considered to be different phenomena in some research publications.