Basically they are saying that a man's sexual attraction to women causes epigenetic markers that can pass on to their daughter if it is not properly erased and if it is combined with weak epigenetic markers from the mother telling the daughter to be sexually attracted to men.
Conversly a woman's sexual attraction to men causes epigenetic markers that can pass on to their son if it is not properly erased and if it is combined with weak epigenetic markers from the father telling the son to be sexually attracted to women.
So apparently they are back to male homosexuality being caused by strong mothers and indifferent fathers! /s
AT the level of the egg and sperm ~