Ever since I wrote a Harry Potter fic I was playing with the idea that the song of mermaids/sirens affects those that have a sexual preference for the gender of the siren who is singing. The reason there are stories about sailors being smitten by mermaids is because they fall in love with women; a male siren wouldn't have the same effect on them. But lesbians and bisexuals would be equally affected by a female siren. And the song of a male siren would affect straight women, gay men and bisexuals, but straight men and lesbians not so much.