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yeah :)
Don't know about fly genders.

How are the macro tubes? I've been thinking of getting some, do you have any advice about those?

they are a pain to use... :D
you can't focus much with them. Fixed focus. You need to move yourself to focus. And zooming won't work either with macro tubes.
But for 10$ they rock :D

Well at that price it won't hurt to try them out at least!