Do the genders in this WYR switch for female choosers, or do the women also turn into mermen?
Nope, whether you are male or female NOW you can transform into a merMAN but everyone calls you a merMAID. Your current gender is irrelevant.
Where should this comment appear?
This pairing only
Whenever "Be able to transform into a mermaid." appears
Whenever "Be able to transform into a merman but everyone SAYS ..." appears