Definitely the Romance
I don't think Romance fans are longing for sex. They're not aching for a good long you-know-what but for some fictional (and better than life) man to adore who they are, warts and all, so to speak, through his adoration of a female protagonist with whom the reader can identify.
Romance readers want someone to scent the bath water, strew the bed with rose petals, light the candles and chill the perfect wine, and to speak of love and desire most poetically, and last to look into their eyes, and enter body and soul simultaneously. (Pardon me while I gag.)
It can end there, for Romance. For good erotica, the scene might include all that, gloss over it, or skip it altogether, depending on the market, but will continue in considerable detail starting at that point.
Totally different markets, totally different kinds of writing.
And I always wonder about the next day in Romance--who's changing the sheets, vacuuming up the rose petals, and scraping the candle wax out of the carpet?