Domain C · Evolutionary theory

Byproducts, not adaptations

There is no serious adaptationist claim that eroticizing feet raised ancestral reproductive success. The live evolutionary questions are byproduct structure, sex differences in conditionability, and what animal learning actually shows.

Byproduct and cue-exploitation models

Mechanism: A nervous system designed to tag any cue that predicts sexual reward will sometimes tag cues with no reproductive function. Fetishes are then the tail of a useful learning device, as phobias are often described as the tail of a useful threat-learning device.
Sources: Pfaus, Kippin, Coria-Avila, Gelez, Afonso, Ismail & Parada (2012). Who, what, where, when (and maybe even why)? Archives of Sexual Behavior 41: 31-62. Hoffmann (2012), “Considering the role of conditioning in sexual orientation,” same volume, on experience elaborating predispositions.
Critique: Explains why any non-reproductive cue can acquire value. Leaves the foot differential untouched. Without an extra selector (adjacency, concealment, frequency of pairing), the model predicts a flat-ish distribution of targets, which Scorolli’s table is not.
Open questions: A formal model that predicts the Scorolli rank order from pairing frequency plus a biological-relevance weight.
Cross-links: B1, A1, E1.

Supernormal stimulus and sensory exploitation

Mechanism: High heels, exaggerated arches, polished nails, and taut hosiery can be read as supernormal versions of gait, youth, or body-shape cues, exploiting a sensory bias past the ancestral range (Tinbergen’s supernormal stimuli).
Sources: Tinbergen’s classic supernormal-egg work as analogy. Application to footwear is interpretive (fashion history plus evolutionary psychology commentary). No direct experimental test on fetishists versus controls was found.
Critique: Post hoc. Faces, breasts, and waist-hip ratio have richer supernormal literatures and are not ‘fetishes’ in the Scorolli sense. The model fits shoe/heel culture better than dirty-sock or tickling subtypes.
Open questions: Do people with podophilia show steeper preference functions for arch height or heel height than controls? Unmeasured.
Cross-links: D4, C3, E4.

Feet as mate-quality signals

Mechanism: Symmetric, well-kept, uninjured feet might advertise health, youth, or freedom from parasites. Erotic attention to feet would then be an assessment device.
Sources: Occasional evolutionary-psychology remarks; no dedicated, well-powered test of foot attractiveness as a health cue predicting fetishism was found in the target journals.
Critique: Hands, skin, gait, and faces already carry health information. A general preference for healthy-looking feet in mate choice (if it exists) is not the same as obligatory fetishistic focus. Grade skeptically.
Open questions: Does foot attractiveness in ordinary mate-rating studies predict anything about fetishistic interest? Unknown.
Cross-links: C2, D1.

Cross-species learned sexual targets

Mechanism: In rats, a neutral or even noxious odor on a first sexual partner produces later preference for that odor. A jacket worn during early copulation becomes necessary for normal performance. Cross-fostered sheep and goats prefer the foster species as mates (Kendrick, Hinton, Atkins, Haupt & Skinner, 1998, Nature). Opioid blockade (naloxone) can prevent the preference; morphine or oxytocin can sometimes substitute for the reward.
Sources: Pfaus et al. 2012 review; Kippin, Talianakis, Schattmann, Bartholomew & Pfaus (1998) and subsequent CEP papers; Pfaus, Erickson & Talianakis on the rodent jacket; Coria-Avila et al. on female rats; Kendrick et al. 1998.
Critique: Phylogenetic evidence that sexual target learning is old and powerful. It still does not select human feet. First-experience effects in rats are closer to Money’s window than to Ramachandran’s map, which is a compatibility note, not a proof.
Open questions: No ethical human analogue of first-ejaculation pairing with a random object has been run at scale, for good reason.
Cross-links: B1, B4, B6.

Male-biased paraphilia as a phylogenetic pattern

Mechanism: Across clinical, forensic, and many community studies, paraphilic interests (especially those that are visual and object-focused) are reported more by men. Explanations include prenatal androgen effects on sexual learning, greater male reliance on visual cues, and reporting bias.
Sources: Ahlers et al. 2011 (Berlin men): fetishistic PASAP 35.7% in a volunteer subset. Bártová, Androvičová, Krejčová, Weiss & Klapilová (2021, Czech online sample): fetishism preference 10.1% men vs 2.4% women. Dawson, Bannerman & Lalumière (2016) on sex differences in paraphilic interest. Scorolli et al. 2007 groups were overwhelmingly male-oriented in practice.
Critique: Joyal & Carpentier (2017): desire for ‘fetishism’ 40.4% men vs 47.9% women (small effect, women slightly higher). Construct mismatch: a questionnaire item about ‘a fetish or nonsexual object’ is not podophilia. Female interest exists and is under-sampled in fetish-organization studies.
Open questions: A foot-specific item in a probability sample, by sex, with a primary-versus-incidental split.
Cross-links: E5, B5, G1.

Confidence, Domain C

Solid: animals learn sexual targets (E1). Contested: every human evolutionary story about feet. Unknown: function. This dossier’s working stance is byproduct-plus-learning, with specificity still begging an extra principle.