If you can feel your characters vicariously, you can’t lose.
You might ask how can I write what I don't know. Aside from pointing out that that's what the publishers ask of you the real answer is we learn. We can learn almost anything.
Next week as a follow up I'll suggest you stay tuned into popular culture if you want to write about romance, because the times, they are a changin'.
Sometimes it's as simple as blocking out a little time for what you love. Raining on Sunday, 2003 sung by Keith Urban: