Romance is more than sex scenes but a bad sex scene can break a book. If you are determined to have sex scenes instead of closed door scenes and you need inspiration, you might want to do what I do — Watch porn.
You don’t have to drop hundreds of dollars buying DVDs or subscriptions. There are plenty of places that have hundreds of hours of clips for free (YouTube for porn). Find an encounter that does it for you and describe it in your book. Sometimes a visual aid is all most people need to get the words to flow.