I didn't mean it in reference to your comment, but in reference to what I feel other writers or commentators are saying, for example this video.
I was actually thinking last night when I lay down to bed, that I remember having my romantic feelings from very early on, from my earliest "sexual" fantasies. It's possible I was influenced by (Russian) fairytales my mom was reading me, but then again I don't remember any fairytales having anything to do with sexual love.
Overall, I'm inclined to think that most of it is innate rather than external, just like most of our inclinations when it comes to sex/love.