i think i have "crabs"

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Crab lice are highly specialized on humans. You don't find them other where. The lice on plants have nothing to do with them. Crab lice are transmitted from human to human, sex is not necessary.

Crab lice stay in every hair that has the right condition. Warm, wet from sweat, and thick close by hair. The best places are the pubs and underarm hair, but if someone is hairy enough or the conditions at pub get worse they can stay on other regions.

Even an excellent hygienic doesn't help against them. You can wash you as often as you want, they will stay. It is nearly impossible to drown them or get them out of the hair without killing them (or cut them with the hair out).