Everyone likes to talk -- or brag -- about how they are x% German and x% Swedish or x% Irish and x% English, or x% Nigerian and x% Native American (OK, you don't hear that one very often but..), but the simple fact is, nobody wants to bring this to the male/female sexual orientation level.
In the Sexual Orientation Spectrum, please name me two people who anchor either side of it. The 100% male heterosexual and the 100% female heterosexual. Ann Coulter and Rush Limbaugh do NOT count. Unless you have inside information.
We are all born of males & females conjoining. Things are bound to get mixed up in the fluids. Those DNA strands are not unlike the vacuum cleaner power cord which can manage to tie itself into knots overnight.