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formicophilia

n. A paraphilia in which sexual stimulation occurs by being crawled upon or nibbled by small insects, such as ants.

Wikipedia
Formicophilia

Formicophilia, a form of zoophilia, is the sexual interest in being crawled upon or nibbled by insects, such as ants, or other small creatures. This paraphilia often involves the application of insects to the genitals, but other areas of the body may also be the focus. The desired effect may be a tickling, stinging or in the case of slugs, slimy sensation, or the infliction of psychological distress on another person. The term was coined by Ratnin Dewaraja and John Money in 1986 from the Latin formica (ant) + philia (love).