Parent slightly misspoke. They asked about heterosexual partners, and not asked heterosexuals about their partners. So homosexual partners would not me included in any counts.
Contrary to popular belief sexual orientation is not a matter of "choice", or temporary mood changes, so it's not like phrasing of the question asked in the survey matters at all. 99% of people have either only heterosexual partners or homosexual partners, not both.
Even if homosexuals were included in that survey, and asked about "how many heterosexual partners you had", them answering "0" wouldn't matter at all (provided that there were roughly the same number of gays and lesbians surveyed)
> 99% of people have either only heterosexual partners or homosexual partners, not both.
Source? Or is this just guesswork? Because the stats I've seen in the past, while varying in numbers, have pretty consistently been that, in the population, from most to least common is:
Opposite sex partners only > Both same and opposite sex partners > Same sex partners only. (Don't have any sources handy, but I'll try to find and post some later.)
Even if homosexuals were included in that survey, and asked about "how many heterosexual partners you had", them answering "0" wouldn't matter at all (provided that there were roughly the same number of gays and lesbians surveyed)