It's really ridiculous! My response was, "What about when/if you fall in love? Does that mean that other people in the world cease to exist and that your sexuality gets turned into a stream that is only attracted to that one person and type forever?" I love my husband and we're monogamous (though I definitely am all for poly relationships and think they're fascinating), but that doesn't mean that I find only men attractive. Oh well-some get it and some don't. I wish I could help people to understand but you know, if they don't accept me, they don't have to be around me.