Re: Ambidextrous likelier to be bisexual.
Really, these cynical attempts to simplify sexual orientation are completely unhelpful to everybody.
They can be invoked by homosexuals to argue that they are genetically pre-disposed towards their sexual orientation, something I think is a gross over-simplification when the bottom line is that sexual acts between consenting adults are legitimate whatever the sex, so long as they are not harming others -- and homosexuals are not harming anybody.
And let's not forget, these so-called findings can also be invoked by heterosexuals (and increasingly they are being) to argue that gays are genetically different from themselves, as are bi-sexuals, and thus heterocentric dominance can continue unabated, because "bi-sexuals" and "homosexuals" will always be a minority.
I've said before that I believe we are all omnisexual. That means potentially open to enjoying all sexual experiences. I dislike the term "bi-sexual" because I believe that is effectively just another classification. That does not mean we act on all of our impulses, still less that we are aware of these potentials for gratification. There are so many environmental and social factors related to gender and so many other variables which interplay. That does not mean that I disregard the concept that people have preferences for one sex or another. I just don't believe in categorisation and people identiying themselves by their sexual orientation.
The truth is we will not know for a long time how many people are "bi-sexual" because all of our institutions are hetero-dominated and people are indoctrinated into gender divisions and almost uniformly (even gays and lesbians) conform accordingly.