On the other hand, there is shared genetics... in that all these creatures are sexed.
Even the genetics of sex vary from species to species! Not all animals use XY; birds and amphibians and fish and insects all have different systems.
Homosexuality also deals with sex.. so it is very reasonable to think hat it would be in the sex genes where there is commonality.
See above. There's no commonality on sex* itself between species in the first place.
* by which I mean gender, except gender is only supposed to apply to words
I think that it is generally thought that sex decended evolutionary and wasn't the result of covergent evolution.
Sexual reproduction obviously didn't. But the particular mechanism for recognizing what is the right thing to have sex with? How could that have any commonality between humans and fruit flies?
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