It's all about hon and honno and hwn and hwnnw..... yes, really !
Hwn and hwnnw are this and that for masculine things...
Hon and honno are this and that for feminine things.
I thunk and thunk for ages about a suitable mnemonic linking the o to the feminine and w to the masculine ... problem is, w stands for woman with is unhelpful to say the least!
But eventually I came up with such a striking visual image that I will never forget which way round they are now ... and you won't either when I've told you it.
BUT ... and there is a but .... it's a bit rude ... which is great for memorability. but bad for just about everything else ... so what I will do is, I'll put the music next, then a nice picture as a sort of spacer for those who don't want to see it, then the remarkably helpful image.
The music is the lovely Sen Segur with a truly smashing song, Cyfoeth Gwlyb ....
Now you will always remember that hwn and hwnnw refer to male things, leaving hon and honno for female things.