Women's Preferences for Penis Size: A New Research Method Using Selection among 3D Models.

Women's preferences for penis size may affect men's comfort with their own bodies and may have implications for sexual health. Studies of women's penis size preferences typically have relied on their abstract ratings or selecting amongst 2D, flaccid images. This study used haptic stimuli to allow assessment of women's size recall accuracy for the first time, as well as examine their preferences for erect penis sizes in different relationship contexts. Women (N = 75) selected amongst 33, 3D models. Women recalled model size accurately using this method, although they made more errors with respect to penis length than circumference. Women preferred a penis of slightly larger circumference and length for one-time (length = 6.4 inches/16.3 cm, circumference = 5.0 inches/12.7 cm) versus long-term (length = 6.3 inches/16.0 cm, circumference = 4.8 inches/12.2 cm) sexual partners. These first estimates of erect penis size preferences using 3D models suggest women accurately recall size and prefer penises only slightly larger than average

Penile Models.

<p>A) Computer graphic representation of one of the ‘print files’ used to produce the 3D penis models. B) Examples of (4 of 33) 3D models showing length in inches. A and D represent the largest and smallest models in the set, respectively; B and C represent the two models (counterbalanced) used to test recall for size.</p

Recalled sizes (immediate and delayed) slightly shorter than actual model with most picking exact model.

<p>Note: “0” indicates the exact correct model was chosen. Positive values indicate that the selected model was larger than the target model.</p

Demographic characteristics of participants.

<p>^a Numbers may not sum to total due to non-response.;</p><p>^b Recall that participants were required to report attraction to men to participate, thus a “Homosexual/Lesbian” self-identity did not preclude attraction to men;</p><p>^c Participants were allowed to indicate more than one option. Top 4 endorsed races or ethnicities are included.</p><p>^d Question wording “How much do you think you care about penis size compared to other women?”</p><p>^e Question wording “Have you ever stopped seeing a man because, among other reasons, his penis was too large[small] compared to what you wanted?”, number indicates count endorsing.</p><p>Demographic characteristics of participants.</p

Size of model selected by women indicating the “average” penis size.

<p>(<i>N</i> = 75, <i>r</i> = .48).</p

Largest and smallest penis experiences.

<p>No evidence of ceiling or floor effects in women’s choices indicating their largest and smallest sexual partner’s penis size.</p

Women's preferences for penis size: A new research method using selection among 3D models

<p>Women’s preferences for penis size may affect men’s comfort with their own bodies and may have implications for sexual health. Studies of women’s penis size preferences typically have relied on their abstract ratings or selecting amongst 2D, flaccid images. This study used haptic stimuli to allow assessment of women’s size recall accuracy for the first time, as well as examine their preferences for erect penis sizes in different relationship contexts. Women (N = 75) selected amongst 33, 3D models. Women recalled model size accurately using this method, although they made more errors with respect to penis length than circumference. Women preferred a penis of slightly larger circumference and length for one-time (length = 6.4 inches/16.3 cm, circumference = 5.0 inches/12.7 cm) versus long-term (length = 6.3 inches/16.0 cm, circumference = 4.8 inches/12.2 cm) sexual partners. These first estimates of erect penis size preferences using 3D models suggest women accurately recall size and prefer penises only slightly larger than average.</p

Sizes of printed models.

<p>Shading indicates the average penis length and girth in the USA. Bold indicates models used for recall (immediate/delayed, counterbalanced) tests. Units are in inches.</p

Preference for larger penis in one-time relative to long-term relationships.

<p>Preference for larger penis in one-time relative to long-term relationships.</p

Molecular electronics sensors on a scalable semiconductor chip: A platform for single-molecule measurement of binding kinetics and enzyme activity.

For nearly 50 years, the vision of using single molecules in circuits has been seen as providing the ultimate miniaturization of electronic chips. An advanced example of such a molecular electronics chip is presented here, with the important distinction that the molecular circuit elements play the role of general-purpose single-molecule sensors. The device consists of a semiconductor chip with a scalable array architecture. Each array element contains a synthetic molecular wire assembled to span nanoelectrodes in a current monitoring circuit. A central conjugation site is used to attach a single probe molecule that defines the target of the sensor. The chip digitizes the resulting picoamp-scale current-versus-time readout from each sensor element of the array at a rate of 1,000 frames per second. This provides detailed electrical signatures of the single-molecule interactions between the probe and targets present in a solution-phase test sample. This platform is used to measure the interaction kinetics of single molecules, without the use of labels, in a massively parallel fashion. To demonstrate broad applicability, examples are shown for probe molecule binding, including DNA oligos, aptamers, antibodies, and antigens, and the activity of enzymes relevant to diagnostics and sequencing, including a CRISPR/Cas enzyme binding a target DNA, and a DNA polymerase enzyme incorporating nucleotides as it copies a DNA template. All of these applications are accomplished with high sensitivity and resolution, on a manufacturable, scalable, all-electronic semiconductor chip device, thereby bringing the power of modern chips to these diverse areas of biosensing