Trained male rats to associate copulation with wearing a [Velcro jacket]. After training, males were sexually aroused by being fitted with the jacket, and even showed reduced sexual activity when exposed unclothed to females

Evaluation and hedonic value in mate choice. Gil G Rosenthal. Current Zoology, zoy054, https://doi.org/10.1093/cz/zoy054

Abstract: Mating preferences can show extreme variation within and among individuals even when sensory inputs are conserved. This variation is a result of changes associated with evaluative mechanisms that assign positive, neutral, or negative hedonic value to stimuli – that is, label them as attractive, uninteresting, or unattractive. There is widespread behavioral evidence for differences in genes, environmental cues, or social experience leading to marked changes in the hedonic value of stimuli. Evaluation is accomplished through an array of mechanisms that are readily modifiable through genetic changes or environmental inputs, and that may often result in the rapid acquisition or loss of behavioral preferences. Reversals in preference arising from “flips” in hedonic value may be quite common. Incorporating such discontinuous changes into models of preference evolution may illuminate our understanding of processes like trait diversification, sexual conflict, and sympatric speciation.

Keywords: associative learning, mating preference, sensory biology, assortative mating, valence

---
Indeed, animals can be trained to develop fetishes: striong, specific preferences for arbitrary stimuly. Pfaus and colleagues trained male rats to associate copulation with wearing a [Velcro jacket]. After training, males were sexually aroused by being fitted with the jacket, and even showed reduced sexual activity when exposed unclothed to females.