Wittgenstein doesn't mean sex with the same sex-it means sex without definition. There's no 'opposite' sex. Therefore, there is no 'same' sex. And when you take away 'opposite' and 'same' then sex is quite a different matter. But why should we identify ourselves-biologically or otherwise.
Identity is such a vulgar Earth-like idea.
So we must have the capacity to know who we are logically and historically prior to having identities. It's like any code. You have to know what something means before you encode it. Now some codes have positive value. It's rather like everyone's different.