Involves becoming sexually obsessed with some inanimate object or some specific non-genital part of a person. Such items are often collected, and elaborate schemes are often devised to collect the fetishes. There is a strong compulsive element to the disorder, and the onset may vary from adolescence to later adulthood. When a male becomes sexually aroused by dressing in garments of the opposite sex, while still regarding himself as a male. May also enjoy appearing in public dressed as a woman.
Arousal is the main goal of cross dressing.
Behaviour is episodic, with episodes increasing in frequency over time because of strong compulsive element to the disorder. Most common explanation of the aetiology of fetishism and transvestism is classical conditioning model whereby sexual arousal becomes paired with fetish or the experience of being clothed in female garments. The incest taboo is almost universal to all societies as it serves an adaptive function evolutionarily because the foetus conceived from sexual activity between close relatives carries far more risk of inherited disorders than a foetus conceived by unrelated partners. Thus, the incest taboo serves to diversify the gene pool of a group because it prohibits sexual relationships between kin, resulting in individuals mating with non-kin. Father-daughter incest is considered the most pathological form of incest, and its persistence often is related to whether the father's partner intervenes.