This is one of the some cases in life that I like been a native "logographic system based language" (I.E. Chinese) user........

Because in Chinese...
If you're heterrosexual , you're 異(diffrent)性(sex)戀(love) (love someone who is opposed sex to you......yup that what those 3 Chinese character put togother means) .

If you're gay or les , you're 同(same)姓(sex)戀(love) (love some one who is same sex as you)

If you're bi-sexual ,you're 雙(bi-)姓(sex)戀(love) (I don't think I have to explain this one).

Any one(as for Chinese) who pass 2nd grade can read the option. simple.

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Also.......someone(the person who made this caption) apearly need to re-take their Basic English classes.......I mean ,that word is not that hard to understand.

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Here is some definition from dictionary.

Hetero-

1. a combining form meaning “different,” , “other,” . used in the formation of compound words

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heterosexual

adjective

1.of, relating to, or exhibiting heterosexuality.

1. Biology. pertaining to the opposite sex or to both sexes.