Didn't say anything about banning anything or Religion. Just said that Sex is enjoyable therefore it encourages reproduction and propagation of the species.
Go back to plonking whatever animals around the Farm you currently find attractive Baz.
You are trying to say homo sex is unnatural as a argument for not allowing gay marriage.
Bottom line is being gay or gays having sex isn't illegal so there is nothing to the argument.
Marriage is man made anyway so again the unnatural/natural argument again doesn't apply.