Morphophilia is a sexual paraphilia involving a sexual arousal initiated by the discrepancy in physical characteristics with one’s own. The arousal hinges on the extreme difference in appearance between themselves and their partner.
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This particular paraphilia can be described in a basic sense by the phrase “opposites attract.” This might include those who experience arousal based on the fact that their partner is obviously thinner or taller than themselves. The difference in physique must be marked to be considered a fetish.