There may be more truth to that than you realize. Sexual predilections, being as powerful and hormonal as they are, induce environmental stresses that may be physically heritable. They could produce changes in messenger RNA (not DNA) that are referred to collectively as "epigenetics," physically heritable traits (including behavioral) that are not in DNA. I remember an amazing experiment with stickleback fish behavior that showed environmentally induced behavioral effects to be sufficient to cross the species barrier even in hybridized progeny.
I was thinking about all the conditioning processes that are in place;
The queer TV programming,
lisping newscasters;
man hating/denegrating commercials;
etc.