Does erotic romance have to have love wound into it?
Short answer? Yes.
If you're a writer (or reader) of romance, you've probably heard by now a breakdown of the differences in "Romance", "Erotic Romance", and "Erotica". ARe Cafe has a short rundown here, but the quick and the dirty of it is:
Romance is a love story.
Erotic Romance is a love story with explicitly sexual description.
Erotica is a sex story. Love need not play a part; the focus is on a sexual journey.