Ideal. I get people asking me all the time!
I sex mine from 3g, then I check again at 5 and 10. Touch wood not been wrong yet! 
Though personally speaking, I have Never seen a pore on a female to this day. Which is why when sexing at 5 I know 100% what the sex is.
Also some males will get a bulge early, 5g early. Usually around 10g you know without looping too! Should be obvious he is a he, in some cases a bulge may not appear til a bit layer on which I know you’ve had with one or your males! I also had this with Pod, was around 18g? When it really popped out! 
He had a slight bulge but fully developed then. But he was sexed at 5g as a Male so I expected it!
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