Gratefully, I note that the numbers of such people may be very small.
Did you even read the study? Are you suggesting such people selectivly mask their attractins to one sex intentionally?
Of course, that's absurd. In the elite women's colleges today, there are large numbers of LUGs -- Lesbians Until Graduation -- girls who find it easier to go along with the prevailing lesbian culture without great enthusiasm, and yet end up in normal heterosexual relationships and marriage when they grow up.
Of course, if homosexuality were genetically determined, it would be dying out: if homosexuals reproduce less frequently than heterosexuals, over time the genetic determinant would become less prevalent and eventually die out, or almost so. No, homosexuals can maintain their numbers only by recruitment. And, that recruitment can be successful only if those they recruit feel they cannot, or at least cannot readily, return to heterosexuality.