How brain damage cures smoking.

High-definition video is embarrassing porn stars. Problems: razor burn, cellulite, wrinkles, pimples, visible veins, fake boobs. Remedies tried so far: diets, exercise, makeup, tanning spray, grooming assistance, cosmetic surgery, softening lights, changing sex positions, and airbrushing. Directors' attitude: HD is cool. Actresses' complaints: 1) The men in the industry are "willing to sacrifice our vanity and imperfections to beat each other" to HD. 2) "I'm having my breasts redone because of HD." (For a previous update on live, on-demand sex, click here. For virtual-sex technology, click here. For the average viewing time of pay-per-view porn, click here.)

Trans fats may cause female infertility. Data: "Each 2% increase in the intake ofenergy from trans unsaturated fats, as opposed to that fromcarbohydrates, was associated with a 73% greater risk of ovulatoryinfertility," even after adjustment for fertility risk factors. Hypothesis: Trans fats disrupt a fertility-boosting "cell receptor involved in inflammation, glucose metabolism and insulin sensitivity." Next: Trans fats cause ADHD and herpes. (For Human Nature's take on banning trans fats, click here.)

Latest Human Nature columns: 1) The power to shrink human beings. 2) The first human embryo factory. 3) The bum rap on cloned food. 4) Lesbians of mass destruction. 5) The Best of Human Nature 2006. 6) Unhealthy food outlawed in New York. 7) Food and sex without consequences. 8) The eerie world of policing cybersex.