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 "You die if you come within 10 meters of anyone ..." appears
Whenever "Be able to transform into a merman but everyone SAYS ..." appears